a. A block of mass 1.29 kg is placed on a frictionless floor and initially pushed northward, whereupon it begins sliding with a constant speed of 3.32 m/s. It eventually collides with a second, stationary block, of mass 3.23 kg, head-on, and rebounds back to the south. The collision is 100% elastic. What will be the speeds of the 1.29-kg and 3.23-kg blocks, respectively, after this collision?
a. 0.57 m/s and 1.54 m/s
b. 1.42 m/s and 1.90 m/s
c. 1.90 m/s and 1.42 m/s
d. 1.84 m/s and 1.66 m/s
b. Same situation as before. This time it's a block of mass 1.50 kg sliding with a constant velocity of 4.04 m/s to the north, which collides 100% elastically with a second, stationary block, of mass 3.10 kg, head-on, and rebounds back to the south, eventually colliding 100% elastically with a wall and rebounding northward. It then overtakes the second block, which is still moving north as a result of the first collision. What will be the speeds of the 1.50-kg and 3.10-kg blocks, respectively, after their SECOND collision with one another?
a. 1.29 m/s and 5.14 m/s
b. 3.90 m/s and 1.27 m/s
c. 2.09 m/s and 3.21 m/s
d. 0.90 m/s and 2.24 m/s