Jack and Sally are standing 10 meters from the bottom of a 100-meter ridge. Suddenly, a large stone falls off the edge of the ridge. Jack and Sally immediately begin to sprint away from the ridge with a rate of 8 meters per second. What is the rate at which the distance between Jack and Sally, and the large stone is varying after two seconds? The height (in meters) of a free falling object that is under the influence of only gravity is h(t) = h0 + v0t − 4.9t2

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