1.A ball of mass1kg is dropped from a height of 7m and rebounds to a height of 4.5m. Calculate: (a) its Kinetic Energy just before impact. (b) its initial rebound velocity and Kinetic Energy. Account for the loss of Kinetic Energy on impact.
(a) kinetic energy of a ball just before impact
(b) the initial rebound kinetic energy of a ball
the initial rebound velocity of a ball
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