Problem 4: A cart (45.0kg) is at rest on a ramp with an unknown slope. You are standing above it pulling up the slope (parallel to the slope) with a force of 140N trying (and failing) to get it to move while friction acts down the slope at 23.0N. a.) Draw a free body diagram for the cart. b.). What is the angle of the ramp to the horizontal? c.) If it takes an applied force by you of 237N (instead of the original 140N) to get it moving up the slope, what is the coefficient of static friction? d.). If you keep exerting this force of 237N while it begins to move at an acceleratic of 0.850m/s, what is the coefficient of kinetic friction?