In the figure, a slab of mass m1 = 43 kg
rests on a frictionless floor, and a block of mass
m2 = 12 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
of magnitude 109 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?