Question

3. A moving train is brought to rest within 20 seconds by applying brakes.
Find the initial velocity, if the retardation due to brakes is 2 m/s^2. ​

Answer 1

Answer:

v = 0 ms-1

t = 20 s

a = -2 ms-2

Substituting the values in the eq.

v = u + at

0 = u + (20 x -2)

u = 40 ms-1

Initial velocity of train is 40 ms-1