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physics

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a body is thrown vertically upward return to the earth in 3sec.
(a)what was the initial velocity of the body
(b)what height did the body reach?
neglect the resistance of air.

  • physics -

    a. hf=ho+vi*t-4.8t^2

    hf,ho are zero, solve for vi

    b. same equation,t=1.5

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