Hi all, My understanding for why a basketball bounces is that the earth acts against the ball, causing it to deform due to the ball having a downwards inertia and wanting to continue travelling down. This deformation reduces the volume inside the ball, in turn increasing the air pressure which pushes against the inside wall of the ball. What I do not understand is why this ball leaves the ground after the deformation. Can someone explain this to me? Thank you in advance.