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physics

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a stone is thrown vertically upward with an initial velocity u from the top of tower, reaches the ground with a velocity 3u. what is the height of tower?

  • physics - ,

    final KE=initialPE-initial KE
    1/2 m v^2=mgh-1/2 m u^2

    1/2m(9u^2-u^2)=mgh

    solve for h.

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