at 25o? A crate of books is to be put on a truck with the help of some planks sloping up at 25o. The mass of the crate is 50 kg, and the coefficient of sliding friction between it and the planks is 0.6. You and your friends push horizontally with a force ~F .
The acceleration of gravity is 9.81 m/s2 .
Once the crate has started to move, how large must F be in order to keep the crate moving at constant speed?
Answer in units of kN.


10 points to correct answer! Thank you in advanced. Please show work so I can comprehend the problem.