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18. Stella (M = 60 kg) is standing next to a sled of mass m = 40 kg on an icy surface. She pushes the sled at 3.0 m/s and bou given answer is 300j
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11 The work IN ook = done by forie x stella is displacant dare W = F xd = mx axc - mxu xd = mxNxd - t = mxv2 = (40) (3) w = 3

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