Question

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

Answers

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

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