Question: 7. An elevator is lifted by its cables at constant velocity. How about the total work done on the elevator? (A) positive (B) negative (C)

7. An elevator is lifted by its cables at constant velocity.

7. An elevator is lifted by its cables at constant velocity. How about the total work done on the elevator? (A) positive (B) negative (C) zero 8. If it takes total work W to give an object a speed v, starting from rest, what will be the object's speed if we do twice as much work on it, again starting from rest? (A) w/2 (B) V2v (C) 2v (D) 4v

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