How high must a body be lifted to gain an amount of potential energy equal to the kinetic energy it has when moving at speed 20 m/s ? The value of acceleration due to gravity at a place is g = 9.8 m/s2
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Now let the height is =h metres
Now ..mgh=(1/2)mv²
=>>h=v²/2g
=>>h=20²/(2×9.8)
=>>h=20.408 metres
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refer to attachment
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