Answer to Question #121381 in Classical Mechanics for qre

Question

If a 12 kg ball is rolled across the floor. It rolls for 5 meters before it reaches a stop. The ball feels a force of 15 N, what is the coefficient of friction on the floor? (Use g = 10m/s/s for this problem)

Answer 1

$$F_f=\mu mg$$

$$15=(12)(10)\mu$$

$$μ=0.125$$