A boy running at an average speed of 4 km tr reaches school from his home in het
D) 6
(D) zero
distance of the school from his home is:
(A) 2 km
(B) 8 km
(C) 4 km
Agir suims in a swimming pool of length 100 m. She swims from one and to a
reaches the starting point again in 2 minutes. The average velocity of the swimmer is
(A) 100 ms
(B) 0.83 ms
(C) 1.67 ms
A car is moving with a uniform velocity of 40 km it. Its acceleration after 1 hour is
(A) 40 km
(B) 20 kom i
(C) 30 km it
A body will have uniform acceleration if its
(A) speed changes at uniform rate
(B) velocity changes at uniform rate
(C) speed changes at non-uniform rate (D) velocity remains constant
A car travels from one town to the other with average speed 20 km/hr If the first has
average speed 30 km/hr, then the average speed of the car in the other half will be
(A) 30 km/h (B) 40 km/h
(C) 50 km/hr
(D) 15 km
(D) zero
Answers
Explanation:
1) ans- (A) 2Km
Given:v=4 Km/h
t = 1/2 hour
as v= distance / time
4= distance/1/2
4= distance× 2 /1
4= distance × 2
4/2 = distance
2 = distance
Distance=2Km
2) ans- Zero
3) ans- Answer: D
Answer is D.
When the car is moving with uniform velocity, then there is nil acceleration in the motion of the car.
Therefore, the total acceleration of the car is 0.
4) ans- Answer- B
As the rate of change of velocity is known as acceleration and in order to have a uniform acceleration the rate of change of velocity should also be uniform rate this is the only condition for a body to have uniform acceleration. The correct option for this problem is option B.
5) Answer- D
Average speed is 20 km/hr.
First half has average speed of 30 km/hr.
60u-20u=40u
=u =600/40
= 15 km/hr.
So option(D) is correct.
Answer:
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