NEET 2025 · PhysicsImpulsePrevious Year Question
A ball of mass 0.5 kg is dropped from a height of 40 m. It hits the ground and rebounds to a height of 10 m. The impulse imparted to the ball during its collision with the ground is (g = 9.8 m/s²):
- A.0
- B.84 N·s
- C.21 N·s✓
- D.7 N·s
Correct Answer
(C) 21 N·s
Solution & Explanation
Correct Answer (C) Solution: Down speed v₁ = √(2×9.8×40) = 28 m/s; up speed v₂ = √(2×9.8×10) = 14 m/s. Impulse = m(v₂ + v₁) = 0.5(14 + 28) = 21 N·s.
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