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an 80 kg boy holding on to a helium balloon jumps off of a 20m tall building and floats to the ground. If the boant force of the balloon is 750 N upward, what is the boy's acceleration and final velocity just before he touches the ground?

  • physics - ,

    80x10-750 =80a
    acceleration a =5/8

    V ssquared = u squared + 2as

    = 2x 5/8 x 20
    = 25

    V= m/s

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