1. What type of motion is exhibited by a freely falling body?
2. Which speed is greater: 54 km/h or 6 m/s?
3. A car covers a distance of 5 km in 20 minutes. Find the velocity of the car in:
a) km min
b) m/s
c) m min
d) km/h
4. A car travels 100 km at a speed of 60 km/h and returns with a speed of 40 km/h.
Calculate its average speed and average velocity.
5. A car travels the first 15 km at a uniform speed of 30 km/h, the next 75 km at a
uniform speed of 50 km/h and the last 10 km at a uniform speed of 20 km/h.
Calculate the average speed for the entire journey.
6. A car travels at a speed of 60 km/h for 0.52 h, at 30 km/h for the next 0.24 h and then
at 70 km/h for the next 0.71 h. What is the average speed of the car?
7. The distance between two stations is 200 km. A train travels the first 100 km at a speed
of 50 km/h. How fast must the train travel for the next 100 km in order to maintain
the average speed of 70 km/h for the whole journey?
8. A car covers the first half of the distance between two places at a speed of 40 km/h and
the second half with a speed of 60 km/h. What is the average speed of the car?
9. Which of the following two options can be zero under certain conditions: average
speed or average velocity? Give examples.
10. Arrange the following in the decreasing order of their speed:
a) A bicycle moving at a rate of 0.1 km/min.
b) A man walking at a speed of 2.2 m/s.
c) A boy skating at a speed of 200 cm/s.
She covers 200 min 10 minutes by
Answers
Answer:
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Explanation:
Given,
Velocity of the motorbike is $$54km/hr
So, the acceleration in k/hr
2
is:
60
1
56
=54×60
=3240km/h
2
And,
The acceleration in m/s
2
is:
3600×3600
3240×1000
=.25m/s
2
Answer:
Answer:
Given :
Acceleration of the body = 2 m/s².
Initial velocity of the body = 10 m/s.
Time = 2 s.
To Find :
Final velocity of the body = ?
Solution :
Using first equation of motion :
⇒ v = u + at
⇒ v = 10 + 2*2
⇒ v = 10 + 4
⇒ v = 14 m/s
Hence, the final velocity of the body after 2 seconds are : 14 m/s.
Important Formulas :
v = u + at
s = ut + ½at²
v² - u² = 2as
Average velocity = ∆x/∆t
Average speed = Total path/Total time
Instantaneous velocity = dx/dt
Average acceleration = ∆v/∆t
Instantaneous acceleration = dv/dt
∆x = x2 - x1 (Displacement)