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Q.

A ball moving with velocity 9 ms-1 collides with another similar stationary ball. If after the collision, both the balls move in directions making an angle of 30° with the initial direction, then their speeds after collision will be

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a

5.2 ms-1

b

0.52 ms-1

c

52 ms-1

d

26 ms-1

answer is A.

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Detailed Solution

The given condition as shown in the figure below.After collision, mv1 sinθ = mv2 sinθ ⇒v1=v2=v∴                   2 mv cos θ= m×9⇒                  2v cos 30°=9⇒                               v=93=33=5.2 ms-1
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