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Question

A stone projected vertically up from the ground reaches a height y in its path at t1 seconds and after further t2 seconds reaches the ground. The height y is equal to

A
12g(t1+t2)
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B
12g(t1+t2)2
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C
12gt1t2
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D
gt1t2
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Solution

The correct option is C 12gt1t2
y=ut112gt21
t1+t2=2ug
(total time of journey)
So, u=g(t1+t2)2
y=g(t1+t2)2t112gt21=12gt1t2

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