Which graph in the figure best represents the variation of velocity with time of a ball which bounces vertically on a hard surface, starting from the moment it rebounds from the surface?

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Throughout the motion the ball has a constant downward acceleration, so the slope of the v - t graph must be a single constant (negative) value: a straight line passing through zero at the top of the flight. Only graph (D) has a constant slope. Option D.

Physics - Kinematics Question with Solution | TestHub

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