Question

A man applies the brake and bring his to rest in 1.5 second if the acceleration of the brakes in 5meter / second² . find its initial velocity?​

Answer 1

Answer:

7.5 m/s

Explanation:

let initial velocity = u

acceleration (a) = -5m/s^2 (negetive sign because the car is slowing down)

time taken to stop (t) = 1.5 s

final velocity= v = 0 m/s (at rest)

use this formula,

$v \: = \: u + \: at$

By substituting values,

0 = u - 5×1.5

0 = u - 7.5

u= 7.5m/s