• 1. What is the work done to hold an 12 kg block at rest 0.5 meters above the ground? 
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• 2.  What is the net work done to lift a 11 kg block a height of 6.2 meters and then lower it back to the ground? 
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• 3. A 71-kg person climbs stairs, gaining 2.1 m in height. Find the work done to accomplish this task.

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To perform the elementary row operation R R R3 on the given m... View the full answer