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Two balls are thrown simultaneously, A v...

Two balls are thrown simultaneously, A vetically upwards with a speed of `20 ms^(-1)` from the ground, and B vetically downwards from height of 40 m with the same speed and along the same line of motion. At what points do the two balls collide? Take `g= 9.8 ms^(-2)`.

A

15 m above from the ground

B

15 m below from the top of the tower

C

20 m above from the ground

D

20 m below fom the top of the tower

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The correct Answer is:
A
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