9. A car travelling at 60 km/h uniformly retards for
10 s and attains a velocity of 45 km/h. Find the
retardation
Ans. 0.42 mis
10. When brakes were applied to a car, it retarded
uniformly at 5 m/s2 and stopped after 15 s. Find
the initial velocity of the car.
(Ans. 75 m
11. A bullet is fired into a wall with a velocity of 50 m/s.
If the bullet stops at a depth of 10 cm inside the
wall, find the retardation provided by the wall
Ans.12.5
12. A car travelling at 18 km/h speeds up to 54 km/h in
5 seconds. What is its acceleration? Ans. 2 m/s
13. A moving train is brought to rest within 20 seconds
by applying brakes. Find the initial velocity if the
retardation due to application of brakes is 2 m/s
Ans. 40 m/s
14. Aracing car has uniform acceleration of 4 m/s. How
much distance will it cover in 10 seconds after the
start?
Ans. 200 ml
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