Question

A train is moving at a velocity of 25 ms-1. It is brought to rest by applying the brakes which produces a uniform retardation of 0.5 ms-2. 
Calculate
(i) the velocity of the train after 10 s
(ii) If the mass of the train is 20000 kg then calculate the force required to stop the train​

Answer 1

Solution :-

(i) v = u – at

= 25 – 0.5 × 10

= 20 m/s

(ii) Mass ( m ) = 20000 kg

We Know that,

Force = Mass × Acceleration

= 20000 x 0.5

= 10000 N