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When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative
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Abatter hits a 0.140-kg baseball that was approaching him at 30 m/s and, as a result, the ball leaves the bat at 40 m/s in the reverse of its original direction. the ball remains in contact with the bat for 2.0 ms. what is the magnitude of the average force exerted by the bat on the ball?
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This is an area of aligned magnetic atoms. Many of these together make up a magnet....
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