power=1/2 m 27.9^2 /time
where time= distance*2/27.9
Some gliders are launched from the ground by means of a winch, which rapidly reels in a towing cable attached to the glider. What average power must the winch supply in order to accelerate a 163-kg ultralight glider from rest to 27.9 m/s over a horizontal distance of 46.8 m? Assume that friction and air resistance are negligible, and that the tension in the winch cable is constant.
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