A ball of mass 0.15 kg is dropped from height 10 m, strikes the ground and rebounds to the same height. Find the magnitude of impulse delivered to it. Take g = 10 m s⁻².
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A ball of mass 0.15 kg is dropped from height 10 m, strikes the ground and rebounds to the same height. Find the magnitude of impulse delivered to it. Take g = 10 m s⁻².

G1 Physics · Accepted Answer

Speed immediately before and after impact is √(2gh)=√200=10√2 m s⁻¹. Taking upward positive, Δp = m(vₐ−vᵦ)=0.15[10√2−(−10√2)]=3√2≈4.24 kg m s⁻¹. Answer: B.