Question

3
A train is moving with a speed of 40 ms-1. On applying the
brakes, it comes to rest in 20 s. What is the magnitude of
average acceleration of the train?
2 ms-2
3 ms-2
4 ms-2
5 ms-2
-​

Answer 1

Answer:

u=20m/s,v=0,t=5s

v=u+at

0=20+a×5

a=−4m/s

2

Therefore, Retardation=4m/s

2