A block of mass 1.67 kg is placed on a frictionless floor and initially pushed northward, whereupon it begins sliding wi

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A block of mass 1.67 kg is placed on a frictionless floor and
initially pushed northward, whereupon it begins sliding with a
constant speed of 3.17 m/s. It eventually collides with a second,
stationary block, of mass 4.73 kg, head-on, and rebounds back to
the south. The collision is 100% elastic. What will be the speeds
of the 1.67-kg and 4.73-kg blocks, respectively, after this
collision?
1.52 m/s and 1.65 m/s
1.65 m/s and 1.52 m/s
2.47 m/s and 1.59 m/s
0.76 m/s and 1.56 m/s