A body is projected upwards with a velocity `u`. It passes through a certain point above the grond after `t_(1)`, Find the time after which the body posses thoruth the same point during the journey.

A body is projected upwards with a velocity `u`. It passes through a c

1.	A body is projected upwards with a velocity `u`. It passes through a certain point above the grond after `t_(1)`, Find the time after which the body posses thoruth the same point during the journey.
Answer» Suppose `v` be the velcity attained by the body after time (i) `t_(1)`. The `v=u-g t_(1)` Let the body reaches the same point at time `t_(2)`. Now velocity will be be donward with same magitude `v`, then …(ii) `-v=u-g t_(2)` (i)-(ii) `rArr2v=g (t_(2)-t_(1))` or `t_(2)-t_(1)=(2v)/(g)=(2)/(g) (u-gt_(1))=2((u)/(g) -t_(1))`.

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A body is projected upwards with a velocity `u`. It passes through a certain point above the grond after `t_(1)`, Find the time after which the body posses thoruth the same point during the journey.

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