A body is thrown up in a lift with a velocity 5 m s - 1 relative to the lift and the time of flight is found to be 0.8 s . The acceleration with which the lift is moving up is ( g = 10 m s - 2 )

Question

A body is thrown up in a lift with a velocity 5 m s - 1 relative to the lift and the time of flight is found to be 0.8 s . The acceleration with which the lift is moving up is ( g = 10 m s - 2 ), 1.5 m s - 2, 2 m s - 2, 2.5 m s - 2, 3 m s - 2

MARKS App · Accepted Answer

Acceleration of body w. r. t. lift = -( g + a) ∴ Time of flight of body, t = 2 u g + a ⇒ a = 2 u - g t t = ( 2 × 5 ) - ( 10 × 0.8 ) 0.8 = 2.5 m s - 2

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