Question Detail
Question
A car of mass 400 kg accelerates from rest to a speed of 20 m/s in 60 seconds. What is the average power produced by the car?
Correct Answer
Option A is the correct answer.
Detailed Explanation
The work done equals the change in kinetic energy: ΔKE = ½ × 400 kg × (20 m/s)² = 200 × 400 = 80000 J. Average power P_avg = Work / time = 80000 J / 60 s = 1333.3 W ≈ 1333 W.
Hint
Average power is the total work done (which equals the change in kinetic energy) divided by the total time.