Question

a moving train brought to rest within 20 seconds by applying brakes . Find the initial velocity, if the retardation due to brakes is 2 ,metre /second

Answer 1

v = 0

t = 20 secunds

a = -2m/s^2

u = ?

2as = v² - u²

=> 2 × -2 × 20 = 0 - u²

=> -80 = -u²

=> u = √80

=> u = 8.9m approkcimateli