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A boy standing on a cliff 50 m high thro...

A boy standing on a cliff 50 m high throws a ball with speed `40 m//s` directly aiming towards a man standing on ground at B. At the same time the man at B throws a stone with a speed of `10 m//s` directly aiming towards the boy.

(a) Will the ball and the stone collide? If yes, at what time after projection?
(b) At what height above the ground the two objects collide?
(c) Draw the path of ball in the reference frame of the stone.

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The correct Answer is:
(a) yes, `sqrt(2)s` (b) zero (c) straight line
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