Question

A body is thrown up in a lift with a velocity u relative to the lift and the time of flight is found to be ( t ). The
acceleration with which the lift is moving up is
(A) ( frac{u-g t}{t} )
(B) ( frac{2 u-g t}{t} )
(C) ( frac{u+B !}{t} )
(D) ( frac{2 u+p t}{t} )

JEE/Engineering Exams

Physics

Solution

4.0 (1 ratings)

( T_{f}=frac{2 u}{g^{prime}} Rightarrow g^{prime}=frac{2 u}{t} Rightarrow g+a=frac{2 u}{t} )
( Rightarrow a=frac{2 u}{t}-g )

A body is thrown up in a lift with a velocity u relative to the lift and the time of flight is found to be ( t ). Theacceleration with which the lift is moving up is(A) ( frac{u-g t}{t} )(B) ( frac{2 u-g t}{t} )(C) ( frac{u+B !}{t} )(D) ( frac{2 u+p t}{t} )