Use the position function s(t) = -16t + 850, which gives the height (in feet) of an object that has fallen for t seconds from a height of 850 feet. The velocity at time t = a seconds is given by the following. s(a) - s(t) lim ta a -t If a construction worker drops a wrench from a height of 850 feet, how fast will the wrench be falling after 4 seconds? ft/s Need Help? Read It

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