1. The problem statement, all variables and given/known data A man is pulling a 40.0 kg crate across a level floor with a horizontal force, and the coefficient of kinetic friction is μk = 0.59 for the crate and the floor. 14. What is the normal force acting on the box? a) 231 N b) 340 N c) 196 N d) 392 N 15. What horizontal force must the man apply to get the crate to accelerate at 2.0 m/s2 ? a) 311 N b) 231 N c) 81 N d) 40 N 2. The attempt at a solution For 14: N = mg = (40.0)(9.8) = 392N For 15: N-Fx = max 392 - Fx = (40.0)(2.0) Fx = 312N but there's no 312N there and I didn't even incorporate the μk?