A ball of mass 5kg moving at speed 2m/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
1m/s,1m/s
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B
0m/s,2m/s
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C
1.2m/s,0.5m/s
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D
1.5m/s,0.2m/s
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Solution
The correct option is B0m/s,2m/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=0m/s
& final velocity of m2,v2=2m/s