Question Detail
Question
A force of 30 N acts on a ball for 1.5 s. If the ball moves off with a speed of 5 m/s after the force is withdrawn, what is the mass of the ball?
Correct Answer
Option A is the correct answer.
Detailed Explanation
Impulse = FΔt = mΔv. Assuming ball starts from rest, m = FΔt / v = 30 × 1.5 / 5 = 45/5 = 9 kg.
Hint
Impulse = change in momentum.