A crate is lifted vertically 1.5 m and then held at rest. The crate has weight 100 N (i. e., it is supported by an upward force of 100 N). How much work was done in lifting the crate from the ground to its final position? 1. 150 J 2. More than 150 J 3. None of these 4. A bit less than 150 J 5. No work was doneNow suppose the crate is lifted so rapidly that air resistance was significant during the raising. How much work was done by the lifting force as the box was raised 1.5 m?1. None of these 2. No work was done. 3. More than 150 J 4. Still 150 J 5. A bit less than 150 J because the air partially supported the crate.
Answers: 2
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A crate is lifted vertically 1.5 m and then held at rest. The crate has weight 100 N (i. e., it is s...
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