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A woman on a bridge 77.4 m high sees a raft floating at a constant speed on the river below. She drops a stone from rest in an attempt to hit the raft. The stone is released when the raft has 7.07 m more to travel before passing under the bridge. The stone hits the water 4.18 m in front of the raft. Calculate the speed of the raft.

  • physics -

    The raft moves 11.25 m during the time it takes for the stone to hit the water. Compute that time (t) and then use it to compute the raft's velocity.

    77.4 m = (g/2) t^2 leads to ->

    t = 3.97 s

    Take it from there

  • physics -

    Sorry about the repeat post; computer problems here

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