A 10.0 kg object is released from the top of an incline with a height of 1.00m. The incline makes a 15.0 degree angle with the horizontal. If the speed of the object is measured to be 3.00m/s at the bottom of the incline, what was the constant frictional force (Fk) along the incline? I have tried everything I can think of to solve this but cannot find the correct solution. The given answer was -13.7N. I started with a force diagram and then I tried setting the x and y forces equal to zero and solving for that but got lost. Any help would be appreciated!