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Posted by on Thursday, February 17, 2011 at 8:09pm.

A rock is thrown from a cliff top at 18m/s, 25 degrees above the horizontal. It lands on the beach 4.2 seconds later.

a) What is the height of the cliff?
b) Hor far from the base of the cliff did the rock land?

  • physics - , Thursday, February 17, 2011 at 8:10pm

    vertical veloctiy: 18sin25

    Hf=hi+viv*t-1/2 g t^2

    hf=0, hi=unknown,viv=18sin25, t=4.2 solve for hi.

    horizontal distance? 18cos25*4.2

  • physics - , Thursday, February 17, 2011 at 8:13pm

    great, thank you so much!

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