Mark and David are loading identical cement blocksonto Davids pickup truck. Mark lifts

Chapter 7, Problem 12

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Mark and David are loading identical cement blocksonto Davids pickup truck. Mark lifts his block straightup from the ground to the truck, whereas David slideshis block up a ramp containing frictionless rollers.Which statement is true about the work done on theblockEarth system? (a) Mark does more work thanDavid. (b) Mark and David do the same amount ofwork. (c) David does more work than Mark. (d) Noneof those statements is necessarily true because theangle of the incline is unknown. (e) None of thosestatements is necessarily true because the mass of oneblock is not given.

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