Normal bounce

A ball of mass \(m\) is dropped from some height in a (uniform) gravitational field of \(g\). It reaches the ground and bounces directly upward, to 70% of its original height. During the bounce, the ball is in contact with the ground for a small, non-zero time interval of \(\delta t\).

What can be said about the normal force between the ball and ground during the interval \(\delta t?\)

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