A block of mass 39 kg lies on an inclined plane, as shown. The horizontal and vertical supports for the plane have lengths of 36 m and 15 m, respectively, and the coefficient of kinetic friction between the plane and the block is 0.3. The magnitude of the force ~F necessary to pull the block up the plane with constant speed is most nearly

Answer 1

Is this multiple choice? What are the choices?

The force required to pull it up the plane at constant speed is the sum of the friction force
m g cosA*mu
and the component of the weight force down the plane
m g sin A

Get the value of the angle A from your fgure