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physics

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a tennis ball of mass 20g is released from rest at a height of 4m above the ground. on hitting the ground,it raises to a height of 3m.find the velocity with which it hits the ground.

  • physics - ,

    falls 4 meters
    v = -g t
    h = Hi - (1/2) g t^2
    g = 9.81 m/s^2
    so

    0 = 4 - 4.9 t^2
    t^2 = 4/4.9
    t = .904 seconds

    v = -9.81 * .904 = -8.87 meters/second

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