Question

A train travelling at 20m/s undergoes a uniform retardation of 2m/s(square) when brakes are applied calculate the time taken to come to rest and the distance travelled from the place where brakes where applied

Answer 1

v = v0 + at = 20 - 2t
so, when is v=0?

now recall that
s = v0*t + 1/2 at^2 = 20t - t^2
plug in your value for t

Answer 2

please continue with the solution

Answer 3

A train travell at 20ms-1 undergone a umform retardation of 2m-2 when breakers are applied calculate the time taken to come to rest and the distance travelled from the place where the breakers were applied