Acceleration given kinetic friction

[IAmSparticus]

1. A crate is sliding down a ramp that is inclined at an angle of 51.1° above the horizontal. The coefficient of kinetic friction between the crate and the ramp surface is 1.171. Find the acceleration of the moving crate.


2. Fnet = mass of object x acceleration


3. Sine I don't have the mass, I'm not sure what to plug into the equation. Can someone walk me through how to solve it?

 

[kuruman]

Draw a free body diagram of the crate. Also consult with

http://farside.ph.utexas.edu/teaching/301/lectures/node49.html

Maybe you don't need the mass.