Friction on Inclines

“A 20 kg box is placed on an inclined plane that makes an angle of 40° with the horizontal. The coefficient of friction between the box and the incline is 0.3. Calculate the acceleration of the box down the incline. Show your work. A 100 kg crate is on an inclined plane with an angle of 25°. If the coefficient of friction is 0.15, what is the acceleration of the crate down the plane? Show your work. ”