Question

A car is moving with 40m/s .On applying brakes it stopped 8 sec .caluclate acceleration​

Answer 1

answer is 5

explanation=since acceleration=velocity /time taken

v=40m/s

t=8

a=40/8

=5

Answer 2

The answer is -5m/s^2
initial velocity (u)= 40m/s
Final velocity (v)= 0m/s [as brakes are applied]
Time taken=8s
Acceleration = Final velocity - Initial
velocity/ time taken
=0 - 40/8
= -40/8
= -5m/s^2