Pathfinder Oscillations & Waves BYU 23

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A volleyball can be modelled as a non-stretchable but flexible spherical envelope of mass m and radius R filled with air at excess pressure delta p. The excess pressure remains unchanged with small deformation in the volleyball when it is hit or when its strikes some rigid surface. Mass of the air inside the volleyball can be neglected. If such a volleyball strikes a rigid wall and bounces back without losing speed, how long will the ball remain in contact with the wall ?

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