Question

A car is retarded by applying brakes at the rate of 2 m/$s^2$ It is finally stopped in 10 s. Find its initial velocity.

Answer 1

Step 1, Given data

Retardation = 2 m/$s^2$

Total time is taken to stop = 10 sec

Final velocity = 0

Step 2, To find the initial velocity

We know from the equation of motion

$v=u+at$

Putting all the values

$0=u-2\times 10$

After solving

u = 20 m/s

Hence the initial velocity is 20 m/s