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Q.

A body is projected vertically upwards. If t1 and t2 be the times at which it is at height h above the point of projection while ascending and descending respectively, then h is

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a

12 gt1t2

b

gt1t2

c

2gt1t2

d

4 gt1t2

answer is A.

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Detailed Solution

O to A: h=u1-12gt12  ----(i)O to B :h=ut2-12gt2  -----(ii)Solving u=g2t1+t2h=12gt1t2
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