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A ping - pong ball strikes a wall with a velocity of 10 ms ^-1. If the collision is perfectly elastic, find the velocity of ball after impact

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- 20 ms ^-1

- 5 ms ^-1

1.0 ms ^-1

- 10 ms ^-1

answer is D.

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Detailed Solution

m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂

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