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JEE Main2009PhysicsMotion in One DimensionActual

Consider a rubber ball freely falling from a height h=4.9 ~m onto a horizontal elastic plate. Assume that the duration of collision is negligible and the collision with the plate is totally elastic. Then the velocity as a function of time the height as function of time will be

Correct answer

2

Step-by-step solution

h = 1 2 gt ^2, v =- gt and after the collision, v = gt . (parabolic) (straight line) Collision is perfectly elastic then ball reaches to same height again and again with same velocity.

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