Question

Body moving with velocity of 40m/s^2 is brought to rest in 5s calculate the disaccleration

Answer 1

hey friend,

in this question

u which means initial velocity=40m/s

v which is final velocity=0 as the object is being in rest.

t which we use for time=5sec

Formula of retardation =v-u/t
=0-40/5
=-8m/sec

hope it will help u

Answer 2

since retardation =final velocity - initial velocity/time
your answer would be
0-40/5
=-40/5
=-8
therefore the retardation of the body is 8mt/sec^2