How hard does the person have to pull to keep the block, Physics

How hard does the person have to pull to keep the block

1. In the following figure, suppose a person is trying to move a 51 kg block by pulling upward with a force F at an angle of 30^o. above the horizontal. Assume the coefficient of kinetic friction μ_k=.4.

153_A person is trying to move a block.png

a) How hard does the person have to pull to keep the block moving with constant velocity?

b) Is this easier or harder than pulling horizontally?

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