1.

When a body is thrown up in a lift with a velocity `u` relative to the lift, the time of flight is found to be `t`. The acceleration with which the lift is moving up isA. `(u - g t)/(t)`B. `(2u - g t)/(t)`C. `(u + g t)/(t)`D. `(2u + g t)/(t)`

Answer» Correct Answer - B
`A_("rel") = (g + a)`
Since `t = (2u)/(A_("rel"))`
`rArr a = ((2u - g t)/(t))`


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