Block 1, with mass m1 and speed 4.0 m/s, slides along an x axis on a frictionless floor and then undergoes a onedimensional elastic collision with stationary blo ck 2, with mass tnz: 0.40m1. The two blocks then slide into a region where the coefflcient of kinetic friction is 0.50; there they stop. How far into that region do

(a) Block 1 and

(b) Block2 slide?