A ball is thrown vertically upwards from the ground. It crosses a point at a height 25 m twice at an interval of 4 sec . Find the initial velocity of ball ( g = 10 m / s 2 )

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t = g 2 u ​ g 2 u ​ = 4 s 2 u = 4 × 10 u = 2 40 ​ = 20 m / s Now Let initial velocity = v 0 ​ final velocity = 20 m / s ( 20 ) 2 − v 0 2 ​ = − 2 × 10 × 25 v 0 2 ​ = 400 + 500 = 900 v 0 ​ = 900 ​ = 30 m / s Initial velocity = 30 m / s

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