Q1. A sedan car of mass 200kg is moving with a certain velocity . It is brought to rest by the application of brakes, within
a distance of 20m when the average resistance being offered to it is 500N.What was the velocity of the motor car?
Ans (a= -2.5 m/s 2 , u=10m/s)
Q2. A car start from rest and acquire a velocity of 54 km/h in 2 sec. Find
(i) the acceleration
(ii) distance travelled by car assume motion of car is uniform
(iii) If the mass of the car is 1000 Kg,what is the force acting on it?
Ans (a=7.5 m/s 2 , s= 15 m , F=7500N)
Q3. A hockey ball of mass .2 Kg travelling at 10 ms -1 is struck by a hockey stick so as to return it along its original path
with a velocity at 2 m/s . Calculate the change of momentum occurred in the motion of the hockey ball by the force
applied by the hockey stick.
Ans (F = 2.4kgm/s)
Q4. Rocket-powered sleds are used to test the human response to acceleration. If a rocket- powered sled is accelerated
to a speed of 444 m/s in 1.8 seconds, then what is the acceleration and what is the distance that the sled travels?
Ans (s= 399.6m)
Q5. A BMW car travelling at 22.4 m/s skids to a stop in 2.55 s. Determine the skidding distance of the car (assume
uniform acceleration)
Ans (a = -8.784 m/s 2 , s = 28.56 m)
Q6. The observation deck of the tall skyscraper 370 m above the street. Determine the time required for a penny to free
fall from the deck to the street below.
Ans (t= 8.69s)
Q7. A plane has a take off speed of 88.3 m/s and requires 1365 m to reach that speed. Determine the acceleration of the
plane and the time required to reach this speed.
Ans (acceleration = 2.86 m/s 2 , time= 30.8s)
Q8. Honda Activita accelerates uniformly from rest to a speed of 7.10 m/s over a distance of 35.4 m. Determine the
acceleration of the bike.
Ans (a=.712 m/s 2 )
Q9. An Aeronautics engineer is designing the runway for an airport. Of the planes that will use the airport, the lowest
acceleration rate is likely to be 3 m/s2. The take off speed for this plane will be 65 m/s. Assuming this minimum
acceleration, what is the minimum allowed length for the runway?
Ans (distance= 704m)
Q10. A vehicle accelerate at the rate of 10m/s2 after the applying of force equal to 50000 N. Find the mass of the
vehicle.
Ans (m = 5000 kg)
Q11. An object of 50 kg gets the speed of 10m/s in 5 second from zero velocity. Calculate the required force applied by
engine of the car.
Ans (force = 100 N)
Q12. The acceleration of two objects are 5m/s2 and 20m/s2. If mass of both the object would be combined and a force
of 50N would be applied on them, what will be their acceleration?
Ans (a = 4 ms –2 )
Q13. The mass of a goods lorry is 4000 kg and the mass of goods loaded on it is 20000 kg. If the lorry is moving with a
velocity of 2m/s what will be its momentum.
Ans (momentum=48000kgm/s)
Q14. A bird is flying with a velocity of 3 m/s. If the momentum of the bird is 3.60 kg m/s what is its mass?
Ans (mass of a bird = 1kg 200g)
Q15. A book slides down a table top and comes to rest position after a certain distance. Name the force acting on the
book. What types of forces are acting on the book? (Balanced/ unbalanced). Which force brought the book to rest?
Answers
Answer:
Q1. A sedan car of mass 200kg is moving with a certain velocity . It is brought to rest by the application of brakes, within
a distance of 20m when the average resistance being offered to it is 500N.What was the velocity of the motor car?
Ans (a= -2.5 m/s 2 , u=10m/s)
Q2. A car start from rest and acquire a velocity of 54 km/h in 2 sec. Find
(i) the acceleration
(ii) distance travelled by car assume motion of car is uniform
(iii) If the mass of the car is 1000 Kg,what is the force acting on it?
Ans (a=7.5 m/s 2 , s= 15 m , F=7500N)
Q3. A hockey ball of mass .2 Kg travelling at 10 ms -1 is struck by a hockey stick so as to return it along its original path
with a velocity at 2 m/s . Calculate the change of momentum occurred in the motion of the hockey ball by the force
applied by the hockey stick.
Ans (F = 2.4kgm/s)
Q4. Rocket-powered sleds are used to test the human response to acceleration. If a rocket- powered sled is accelerated
to a speed of 444 m/s in 1.8 seconds, then what is the acceleration and what is the distance that the sled travels?
Ans (s= 399.6m)
Q5. A BMW car travelling at 22.4 m/s skids to a stop in 2.55 s. Determine the skidding distance of the car (assume
uniform acceleration)
Ans (a = -8.784 m/s 2 , s = 28.56 m)
Q6. The observation deck of the tall skyscraper 370 m above the street. Determine the time required for a penny to free
fall from the deck to the street below.
Ans (t= 8.69s)
Q7. A plane has a take off speed of 88.3 m/s and requires 1365 m to reach that speed. Determine the acceleration of the
plane and the time required to reach this speed.
Ans (acceleration = 2.86 m/s 2 , time= 30.8s)
Q8. Honda Activita accelerates uniformly from rest to a speed of 7.10 m/s over a distance of 35.4 m. Determine the
acceleration of the bike.
Ans (a=.712 m/s 2 )
Q9. An Aeronautics engineer is designing the runway for an airport. Of the planes that will use the airport, the lowest
acceleration rate is likely to be 3 m/s2. The take off speed for this plane will be 65 m/s. Assuming this minimum
acceleration, what is the minimum allowed length for the runway?
Ans (distance= 704m)
Q10. A vehicle accelerate at the rate of 10m/s2 after the applying of force equal to 50000 N. Find the mass of the
vehicle.
Ans (m = 5000 kg)
Q11. An object of 50 kg gets the speed of 10m/s in 5 second from zero velocity. Calculate the required force applied by
engine of the car.
Ans (force = 100 N)
Q12. The acceleration of two objects are 5m/s2 and 20m/s2. If mass of both the object would be combined and a force
of 50N would be applied on them, what will be their acceleration?
Ans (a = 4 ms –2 )
Q13. The mass of a goods lorry is 4000 kg and the mass of goods loaded on it is 20000 kg. If the lorry is moving with a
velocity of 2m/s what will be its momentum.
Ans (momentum=48000kgm/s)
Q14. A bird is flying with a velocity of 3 m/s. If the momentum of the bird is 3.60 kg m/s what is its mass?
Ans (mass of a bird = 1kg 200g)
Q15. A book slides down a table top and comes to rest position after a certain distance. Name the force acting on the
book. What types of forces are acting on the book? (Balanced/ unbalanced). Which force brought the book to rest?
Explanation:
I NEED 100 POINTS FOR THIS QUESTION