Adisa pulls a 35.0-N crate up a 4.00-m-long inclined plane at a ...

[wrbasek0]

Adisa pulls a 35.0-N crate up a 4.00-m-long inclined plane at a constant velocity. If the plane is inclined at an angle of 39.0 to the horizontal and there is a constant force of friction of 13.0 N between the crate and the surface, what is the net change in potential energy of the crate?
 a. 88 J
  b. 88 J
  c. 109 J
  d. 109 J
  e. None of these

Question 2

A 35.0-N crate is pulled up a 4.0-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 25.0 N between the crate and the surface, what is the force applied by the worker?
 a. zero
  b. 3.95 N
  c. 21.1 N
  d. 46.1 N
  e. 84.2 N

[Hikerman221]

Answer to Question 1

a

Answer to Question 2

d