Solution: A 5 kg box rests on top of a 10 kg box. The friction coefficients between the 10 kg box and the floor are μs1 = 0.4 and μk1 = 0.3, and the friction coefficients between the 10 kg box and the 5 kg box are μs2 = 0.35 and μk2 = 0.25. A horizontal force, F, is applied on the 10 kg box. What is the minimum value of F required to start moving the boxes?
A) 29.4 N
B) 39.2 N
C) 44.1 N
D) 58.8 N

A 5 kg box rests on top of a 10 kg box. The friction coefficients between the 10 kg box and the floor are μ_{s1} = 0.4 and μ_{k1} = 0.3, and the friction coefficients between the 10 kg box and the 5 kg box are μ_{s2} = 0.35 and μ_{k2} = 0.25. A horizontal force, F, is applied on the 10 kg box. What is the minimum value of F required to start moving the boxes?

A) 29.4 N

B) 39.2 N

C) 44.1 N

D) 58.8 N