Question

A 3.1-kg block is traveling in the −x direction at 5.4 m/s, and a 0.9-kg block is traveling in the +x direction at 3.1 m/s.

(a) Find the velocity v_cm of the center of mass.
_____m/s

(b) Subtract v_cm from the velocity of each block to find the velocity of each block in the center-of-mass reference frame.

3.1-kg block	____m/s
0.9-kg block	____ m/s

(c) After they make a head-on elastic collision, the velocity of each block is reversed (in the center-of-mass frame). Find the velocity of each block in the center-of-mass frame after the collision.

3.1-kg block	____ m/s
0.9-kg block	____ m/s

(d) Transform back into the original frame by adding v_cm to the velocity of each block.

3.1-kg block	____ m/s
0.9-kg block	____ m/s

Answer 1