Physics Problem : Work, Force, Energy

Question

A box with a mass of 3000 g slides down the slope. The slope is inclined at an angle of 30 degrees and has a length of 1 meter. The box starts from rest at the top, experiences a constant force of friction with a magnitude 5.00 N, and begins to travel a short distance to the horizontal floor after leaving the slope. Calculate the box's speed at the bottom of the slope.

Answer 1

Sorry the ending was rushed, I ran out of time. Just let me know if you have any other questions or see an error in my calculations.