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Question

A body is projected upward  with a velocity u. It passes through a certain point above  the ground after t1. From this instant, the time after which the body passes through the same point during the return journey is



A

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B

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C

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D

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Solution

The correct option is C


Suppose v be the velocity attained by the body after time t1. Then 

v = u - g t1  .. (i)

Let the body reache the same points at time t2. Now velocity will be downward with same magnitude v ,
then 

- v = u - g t2  .. (ii)

or t2t12vg2g (u - g t1) = 2 ( ug - t1)

 


Physics

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