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March 29, 2017

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A rock is thrown from on a cliff with the velocity of 15 m/s at an angle of 30 degrees. it takes the rock 6.30 seconds to hit the ground. how high was the cliff?

  • Physics - ,

    hfinal=hinitial+Vi*t-4.9t^2

    you have hfinal=0, t, Vi=15sin30, solve for hinitial

  • Physics - ,

    Where does the 4.9 come from though?

  • Physics - ,

    1/2 g= 4.9

  • Physics - ,

    Oh, is it .5 multiplied by the acceleration of gravity?

  • Physics - ,

    yes.

  • Physics - ,

    Alright. Thank you so much for your help!

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