3 points P,Q,R are in a vertical line such that PQ=QR.A ball at P is allowed to fall freely.what is the ratio of the times of descent through PQ and QR?
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S = UT + ½ AT2
=> 2x = 0 + ½ g(t1 + t2)2
=> x = ¼ g(t1 + t2)2
=> 4x = g(t1 + t2)2 (1)
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