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Question

A ball of mass 5 kg moving at speed 2 m/s makes a head on collision with an identical ball at rest. The velocities of the balls after the perfectly elastic collision between them are respectively:-

A
1 m/s,1 m/s
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B
0 m/s,2 m/s
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C
1.2 m/s,0.5 m/s
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D
1.5 m/s,0.2 m/s
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Solution

The correct option is B 0 m/s,2 m/s

Given, the collision is perfectly elastic, e=1.
Since m1=m2 and e=1,
the balls will exchange their velocity.
Therefore, final velocity of m1,v1=0 m/s
& final velocity of m2,v2=2 m/s

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