NEET 2021 · PhysicsImpulsePrevious Year Question
A ball of mass 0.15 kg is dropped from a height of 10 m, strikes the ground and rebounds to the same height. The magnitude of the impulse imparted to the ball is nearly (g = 10 m/s²):
Answer: (D) 4.2 kg·m/s. Correct Answer (D) Solution: v = √(2gh) = √200 ≈ 14.14 m/s.
- A.21 kg·m/s
- B.1.4 kg·m/s
- C.0 kg·m/s
- D.4.2 kg·m/s✓
Correct Answer
(D) 4.2 kg·m/s
Solution & Explanation
Correct Answer (D) Solution: v = √(2gh) = √200 ≈ 14.14 m/s. The velocity reverses, so |Δp| = 2mv = 2 × 0.15 × 14.14 ≈ 4.2 kg·m/s.
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