Question

a moving train is become to rest in 20 seconds by applying brakes find the initial velocity if the returned ation due to brexit 2 metre per second square ​

Answer 1

Let, u be the initial velocity

Retardation is a Time is t

Velocity is v

We know, v = u + at

As, the train stops so v = 0 Time t = 20s

Retardation a = 15m/s

Therefore, according to the formula u = 0 + (15*20) = 300 m/s.