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## Homework Statement

Prob. 3. A block of mass M = 20.0 kg is pushed up a rough inclined plane 37o to the horizontal by a constant force F parallel to the incline as shown. The co-efficient of kinetic friction between the block and the incline is µ = 0.25, and the block is moving up with a constant speed of 2.5 m/s between A and B.

## Homework Equations

## The Attempt at a Solution

What is the magnitude of F ?

F = 0.25*200cos37 + 200sin37 = 160N

Can you explain the 200sin37 part. Is that gravity can you break it apart

also

gravitational force ? Wg = - 20*200sin37 = - 2400J :

i thought it would be 20*10*20sin37

is gravity force g*m*d where d is the hypotenuse or is the vertical side of the right triangle?

thanks