A box is raised at constant speed by a man pulling up on a rope. During the asce

Question

A box is raised at constant speed by a man pulling up on a rope. During the ascent, which of the following are true (select more than one if applicable). Assume that air resistance on the box is negligible. The work performed by all conservative forces on the box is 0. The work performed by all non-conservative forces on the box is 0. The network performed on the box is 0. The work performed by all conservative forces on the box is positive. The work perfomed by all non-conservative forces on the box is positive. flil o rcosuit of your answer to the previous question, use the work-enorgy theorem to determine which of the 0 O O The change in the total energyif the box is 0. The change in the total energy of the box is positive. The change in the total energy of the box is negative

Explanation / Answer

1). (a)    work performed by all the non conservative forces is zero, as there are no non conservative forces        (b)   net work performed by all conservative forces is positive ,as the work is converted in to gravitational                 potential   energy

2).change in total energy of the body is positive         

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