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Perfectly Inelastic Collision

A moving mass...

Question

A moving mass of 8kg collides elastically with a stationary mass of 2kg. If E be the initial kinetic energy of the moving mass the kinetic energy left with it after the collision will be

A

0.80 E

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B

0.64 E

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C

0.36 E

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D

0.08 E

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Solution

The correct option is D 0.36 E
Fractional KE remaining after collision
$= (\frac{m_{1} - m_{2}}{m_{1} + m_{2}}) = (\frac{8 - 2}{8 + 2}) = 0.36$

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