Question

A train moving with a velocity of 20m/s is brought to rest by applying brakes in 5s calculate the retardation

Answer 1

Answer:

-4m/s2

Explanation:

Given:- v=0m/s

u=20m/s

t=5s

Therefore, a=v-u/t

=0-20/5

= -4m/s2

Hence, a=-4m/s2

Answer 2

Answer:

4m/s²

Explanation:

u = 20m/s

v = 0

t = 5s

Using v= u+at

0 = 20 + a (5)

5a = 20 - 0

5a = 20

a = 20/5

= 4m/s²

Retardation = - 4m/s²