Question

Find the initial velocity of a car which is stopped in 10 seconds by applying brakes The retardation due to brakes is 2.5 m/s2​

Answer 1

Given: Final velocity, v=0 m/s , Retardation, a=−2.5 m/s

2

Time, t=10s

Use first equation of motion-

Let u be the initial velocity of the car.

As the acceleration is constant, so we can use equations of motion

v=u+at

⇒ 0=u+(−2.5)×10

∴ u=25m/s

Answer 2

Explanation:

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