From a tower 10 m height a ball is dropped. After striking the ground 40% of energy of the moving ball was lost. How much high can the ball bounce back with the left energy? (g = 10 ms-2).

From a tower 10 m height a ball is dropped. After striking the ground 40% of energy of the moving ball was lost. How much high can the ball bounce back with the left energy? (g = 10 ms-2).