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The ratio of useful energy output to total energy input is called energy .
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What is the length x of the side of the triangle below? (hint: use the cosine function)
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Ben (55kg) is standing on very slippery ice when junior (25kg) bumps into him. junior was moving at a speed of 8 m/s before the collision and ben and junior embrace after the collision. find the speed of ben and junior as they move across the ice after the collision. give the answer in m/s. describe the work you did to get the answer.
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The ratio of useful energy output to total energy input is called energy ....
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