A car moving at 72 km/h brakes uniformly to rest in 4 s. Its deceleration is:

  1. 20 m/s^2
  2. 5 m/s^2
  3. 18 m/s^2
  4. 2.5 m/s^2
Answer

B) 5 m/s^2

72 km/h = 20 m/s; a = 20/4 = 5 m/s^2. SLO P-11-B-04 · Application

Physics MCQ · More Kinematics and Projectile Motion MCQs · Practise