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Two balls are thrown simultaneously, (A) vertically upwards with a speed of \( 20 \mathrm{~m} / \mathrm{s} \) from the ground and \( (\mathrm{B}) \) vertically downwards from a height of \( 40 \mathrm{~m} \) with the same speed and along the same line of motion. At which point will the balls collide? \( \left(\right. \) take \( \mathrm{g}=10 \mathrm{~m} / \mathrm{s}^{2} \) )
(1) \( 15 \mathrm{~m} \) above from the ground
(2) \( 15 \mathrm{~m} \) below from the top of the tower
(3) \( 20 \mathrm{~m} \) above from the ground
- (4) \( 20 \mathrm{~m} \) below from the top of the tower
\( \mathrm{P} \)
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