Question

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

Answer 1

Answer:

Time (t) = 10 sec

Retardation (a) = 2.5 m/s²

Final velocity (v) =0

Now, from 1st equation of motion,

v=u +at

0=u+ 2.5×10

u= -25

Therefore, the initial velocity is 25 m/s in the opposite direction

Hope it helps :)