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object a does a freefall motion from an 80-m building and object b thrown upward from the base at the same time. they collide after 2s. find the initial velocity of object b. height is 80 m.

  • physics - ,

    object 1: h=80-1/2 g t^2
    object 2: h=vi*t-1/2 g t^2

    set them equal.
    solve for vi

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