Question

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

Answer 1

here is your answer

given :

initial velocity (u) = 20 m/s

final velocity (v) = 0

time taken (t) = 5 seconds

to find : retardation

solution :

by using first equation of motion

v = u+at

0 = 20+5a

5a = -20

a = -4 m/s²

so,the retardation of train will be -4 m/s².

Answer 2

$\huge\underline\pink{\tt Hey \: mate }$

Answer:

initial velocity = 20m/s

final velocity = 0

time = 5second

Now

v = u + at

0 = 20 + 5a

a = - 4m/s²

Hence accleration is -4m/s² (Retardation)

$\huge\underline\green{\tt Thank\: u}$