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Q: a freely falling object requires 1.50s to travel the last 30.0m before it hits the ground . From what height above the ground did it fall ??

Pleazzzz help ....

  • physical -

    Let H be the height from which it is dropped. Let T be the time it takes to hit the ground. Solve these two simultaneous equations:

    H = (1/2) g T^2

    H-30 = (1/2) g (T-1.5)^2

    By subtracting equations, H can be eliminated immediately:

    30 = 1.5 g T - (1/2) g (1.5)^2

    Solve for T first, then compute H.

  • physical -

    t= 2.79 H=38.1

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