A ball is thrown horizontally from a height of \( 20 \mathrm{~m} \). It hits the ground with a v...

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A ball is thrown horizontally from a height of \( 20 \mathrm{~m} \). It hits the ground with a velocity three times its initial
P velocity. The initial velocity of ball is

W
(1) \( 2 \mathrm{~m} / \mathrm{s} \)
(2) \( 3 \mathrm{~m} / \mathrm{s} \)
(3) \( 5 \mathrm{~m} / \mathrm{s} \)
(4) \( 7 \mathrm{~m} / \mathrm{s} \)
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