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