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In the figure shiown a stationary boy (a...

In the figure shiown a stationary boy (at a poing A ) throws a ball towards a fixed wall which is 20 m away from him. The ball hits the wall elastically and hits the ground at the point B, 20 m behind the boy. The total tiem elapsed id `T_(1)` The boy again throws the ball with same speed but at different angle from same point A towards the wall and after collision with the wall ball lands at same point B. But this time elapsed is `T_(2^.)`If `(T_(2)-T_(1))` = 1s, choose the correct potions.

A

a. Speed of throw of balls is 20 m/s

B

b. Speed of throw of balls id 25 m/s

C

c. The difference in their angle of projrctions is nearly `16^(@)`

D

d. The difference in the height of the points where balls hit the wall is nearly 10 m

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