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Q.

A ball moving with velocity of 8m/s collides with another identical stationary ball. After collision each ball moves in direction making an angle of 60° with the initial direction. After the collision speed of each particle will be 

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a

2 m/s

b

8 m/s

c

80 m/s

d

4 m/s

answer is C.

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Detailed Solution

By LCLM in x-direction m(8)=2mvcos600
⇒m(8)=2mv×12
⇒v=8m/s

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