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Q.

Two billiard balls of mass 0.05 kg each moving in opposite directions with 10 m/s collide and rebound with the same speed. If the time duration of contact is t = 0.05s, then the magnitude of force exerted on the ball due to each other is_____ N

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answer is 20.

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Detailed Solution

ΔP=m(v−u)=0.05(20)=1 ∴ F=ΔPΔt=15×10−2=1005=20N

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