5. Mark and David are loading identical cement blocks onto David's pickup truck. Mark lifts his block straight up from the ground to the truck, whereas David slides his block up a ramp on massless, frictionless rollers. Which statement is true? A. Mark does more work than David B. Mark and David do the same amount of work C. David does more work than Mark D. None of these statements is neces sarily true because the angle of
5. Mark and David are loading identical cement blocks onto David's pickup truck. Mark lifts his block straight up from the ground to the truck, whereas David slides his block up a ramp on massless, frictionless rollers. Which statement is true?
A. Mark does more work than David
B. Mark and David do the same amount of work
C. David does more work than Mark
D. None of these statements is neces sarily true because the angle of the incline is unknown
E. None of these statements is neces sarily true because the mass of one block is not given
6. A worker pushes a wheelbarrow 5.0 m along a level surface, exerting a constant horizontal force of 50.0 N. If a frictional force of 43 N acts on the wheelbarrow in a direction opposite to that of the worker, what net work is done on the wheelbarrow?
A. 250 J
B. 215 J
C. 35 J
D. 15 J
E. 45 J
7. An athlete jumping vertically on a trampoline leaves the surface with a velocity of 8.5 m/s upward. What maximum height does she reach?
A. 13 m
B. 2.3 m
C. 3.7 m
D. 0.27 m
E. The answer can't be determined because the mass of the athlete isn't given
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