일반물리학 1 — Force and Motion-II: Problem 34

34 In Fig. 6-39, a slab of mass $m_1 = 40 \text{ kg}$ rests on a frictionless floor, and a block of mass $m_2 = 12 \text{ kg}$ rests on top of the slab. Between block and slab, the coefficient of static friction is 0.60, and the coefficient of kinetic friction is 0.40. A horizontal force $\vec{F}$ of magnitude 120 N begins to pull directly on the block, as shown. In unit-vector notation, what are the resulting accelerations of (a) the block and (b) the slab?