Physics kinematics

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the general "hang time" of a punt is measured to be 4.5sec. if the ball was kicked @ an angle of 63deg. above the horizontal & was caught @ the same level from which it was kicked, what was its initial speed?

  • Physics kinematics -

    time to top = 4.5/2 = 2.25 seconds
    vertical velocity v = Vo + a t
    at top v = 0
    0 = Vo - 9.8 (time to top)
    Vo = 9.8 (2.25)
    Vo = 22.05
    sin 63 = 22.05/speed
    speed = 22.05/ .891
    =24.7

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