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 A ball is dropped from a height of \(10\ m\). If the energy of the ball reduces by \(40\ %\) after striking the ground, how much high can the ball bounce back? (\(g\ =\ 10\ m s^{–2}\)).
 
The formula to calculate the Potential energy (\(P.E\)) is,
 
Height \(=\)  \(m\)