Block 1, with mass m1 and speed 2.1 m/s, slides along an x axis on a frictionless floor and then undergoes a one-dimensional elastic collision with stationary block 2, with mass m2 = 0.48m1. The two blocks then slide into a region where the coefficient of kinetic friction is 0.57; there they stop. How far into that region do (a) block 1 and (b) block 2 slide?