Question

A car decreases its speed from 90 km/h to 72 km/h in 5 seconds. Find the acceleration of the car.

Answer 1

Answer:

Initial speed u=80 km/h=80×

18

5

=22.22 m/s

Final speed v=60 km/h=60×

18

5

=16.67 m/s

Using v=u+at

Or 16.67=22.22+α×5

⟹ a=−1.1 m/s

2