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a man on a dock is pulling in a boat by means of a rope attached to the bow of the boat 1ft above the water level and passing through a simple pulley located on a dock 8ft above the water level. if he pulls in the rope at a rate of 2ft/sec, how fast is the boat approaching the dock when the bow of the boat is 24ft from the point that is directly below the pulley?

  • calculus -

    consider y=0 at the bot bow, so the pulley is at height 7

    if the boat is at distance x, the length r of the rope from pulley to boat, is given by

    r^2 = x^2 + 7^2
    when x=24, r=25
    dr/dt = -2

    2r dr/dt = 2x dx/dt
    2(25)(-2) = 2(24) dx/dt

    dx/dt = -25/12 ft/s

  • calculus -

    how ambiguous a way to present the problem

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