Question

a moving train is brought to rest within 20seconds. find the initial velocity if the retardation due to application of brakes is 2m/s^2​

Answer 1

let u be the initial velocity

and the time be T

velocity is V

V = u +at

as the train stops so v is equal to 0 and time is equal to 20s

retardation a = 15m/s

therefore according to formula u = 0+( 15*20)

=========300m/s