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Math Help - Falling stone!

  1. #1
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    Question Hello!

    A stone is thrown horizontally with an initial speed of 7.5 m/s from the edge of a cliff. A stopwatch measures the stone's trajectory time from the top pf the cliff to the bottom to be 2.5 s. What is the height of the cliff?
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  2. #2
    Super Member malaygoel's Avatar
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    Quote Originally Posted by babygirl
    A stone is thrown horizontally with an initial speed of 7.5 m/s from the edge of a cliff. A stopwatch measures the stone's trajectory time from the top pf the cliff to the bottom to be 2.5 s. What is the height of the cliff?
    h=\frac{1}{2}gt^2
    Solving, h=31.25m(g=10m/s^2)

    Malay
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  3. #3
    Super Member

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    Hello, babygirl!

    A stone is thrown horizontally with an initial speed of 7.5 m/s from the edge of a cliff.
    This can be replaced with "A stone is dropped from the edge of a cliff."

    A stopwatch measures the stone's trajectory time from the top of the cliff
    . . to the bottom to be 2.5 s. .What is the height of the cliff?

    A horizontal initial speed has no effect on the stone' descent.

    Malay's solution is absolutely correct . . .

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