A 40-N Crate Is Pulled Up a 4-M Inclined Plane

Multiple Choice

A 40-N crate is pulled up a 4-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 10 N between the crate and the surface,what is the force applied by the worker?

A) zero
B) 14 N
C) 24 N
D) 34 N
E) ​136 N