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The 'e' Equation

A ball hits t...

Question

A ball hits the ground and loses 20% of its momentum. Coefficient of restitution is

A

0.2

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B

0.4

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C

0.6

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D

0.8

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Solution

The correct option is D 0.8
Initial mom $= m v$
Final mom $= 0.8 m v$
ratio of final to initial momentum is e
i.e $e = 0.8$

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