An 85-N box of oranges is being pushed across a horizontal floor. As it moves, it is slowing at a constant rate of 0.90 m/s each second. The push force has a horizontal component of 20 N and a vertical component of 25 N downward.
Calculate the coefficient of kinetic friction between the box and the floor.
The Attempt at a Solution
I have no idea how to solve this problem, here's what i wrote down on the test and only missed 7 points on a 17 point problem:
A = -0.90m/s^2
Fx = µxN
Fx = -0.90 * 20
Fx = -18 N