Question

If a car decelerates from 40m/s to 10m/s in 3s then deceleration for the body would be equal to?

Answer 1

hey dear
here is your answer

initial velocity = 40 m/s
final velocity = 10 m//s
Time = 3 seconds

so, by the 1st equation of motion
v == u+at
10 = 40+3a
-30 = 3a
a = -10 m/s²

so, the retardation or deceleration of car is -10 m/s²

hope it helps :)