18. [lpt] A person pushes a block along a level floor with a small, non-zero coe

Question

18. [lpt] A person pushes a block along a level floor with a small, non-zero coefficient of friction at constant speed. The work done by the person A) is zero B) is less than zero C) is greater than zero D) could be (+ or (-) depending upon coordinate system Answer Submit All Answers 19. [1pt Two boxes that are the same size need to be stacked on top of each other. Their masses are 10 kg and 30 kg, respectively. In which case will you do more work? A) 10 kg on top B) 30 kg on top C) not enough information D) equal work for both ways Answer Submit All Answers

Explanation / Answer

here,

18)

for the person to push the block at constant speed with non-zero coefficent of friction

the work done is against the frictional forces

so the work done by person is C) greater than zero

19)

for more work, we have to do more work against the gravitational force (mgh)

so, the B) 30 kg on top

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