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A very tall crane of height h has a pulley and a light on top. The...

  1. A very tall crane of height h has a pulley and a light on top. The pulley is raising a girder of length L feet. The shadow is growing at a rate of 1/5 L feet per second when the length of the shadow of the girder is 2L feet.

    (a) How high is the girder at this instant?
    (b) How fast is the girder rising at this instant?

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