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A ball was thrown by a boy a at angle 60...

A ball was thrown by a boy a at angle `60^(@)` with horizontal at height 1 m from ground. Boy B is running in the plane of motion of ball and catches the ball at height 1 m from ground. He finds the ball falling vertically. If the boy is running at a speed 20 km/hr. Then the velocity of projection of ball is-

A

20 km/hr

B

30 km/hr

C

40 km/hr

D

50 km/hr

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The correct Answer is:
C
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