A 50-N Crate Is Pulled Up a 5

A 50-N crate is pulled up a 5.0-m inclined plane by a worker at constant velocity.If the plane is inclined at an angle of 37° to the horizontal and there exists a constant frictional force of 20 N between the crate and the surface,what is the force applied by the worker?

A) zero
B) 50 N
C) 30 N
D) 40 N

Correct Answer:

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