Consider a rubber ball freely falling from a height h equals 4.9 blank 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 will be

The correct answer is:

    h equals fraction numerator 1 over denominator 2 end fraction g t to the power of 2 end exponent comma blank(paraboli(c)
    v equals negative g tand after the collision, v equals g t (straight line)
    Collision is perfectly elastic then ball reaches to same height again and again with same velocity

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