Question

A train is moving at a velocity of 25 m/s. It is brought to rest by applying
the brakes which produces a uniform retardation of 0.5m/s2 . Calculate
a) The velocity of the train after 10 s.
b) If the mass of the train is 20,000 kg then calculate the force required
to stop the train.

Answer 1

Explanation:

I have explained in the pic

may it helps you

Answer 2

u=20m/s,v=0,t=5s
v=u+at
0=20+a×5
a=−4m/s
2

Therefore, Retardation=4m/s