A ball moving with a speed of 9ms−1 strikes an identical stationary ball such that after the collision the direction of each ball makes an angle of 300 with the original line of motion. The speed of two balls after the collision is:
A
3ms−1, 3ms−1
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B
3√3ms−1, 3√3ms−1
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C
3√3ms−1, 3ms−1
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D
3ms−1, 3√3ms−1
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Solution
The correct option is B3√3ms−1, 3√3ms−1
Applying conservation of linear momentum in the direction perpendicular to the initial velocity :
mv1sin60°−mv2sin60°=0
v1=v2
Applying conservation of linear momentum in the direction of initial velocity of the first ball :