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Wnet = 1/2mv^2 (Final) - 1/2mv^2 (Initial) Initial = 0 because the sled started from rest, so we first need to find the final. KE = 1/2mv^2 m = 75kg v = 6m/s KE = 1/2 (75)(36)^2 = 1350j 1350j is our energy, to find force we use E = Fd so F= E/d d = 4.5m F...