A 3.0 kg hockey puck on a frictionless surface moves at 8.0 m/s
toward a stationary 4.0 kg hockey puck. The 3.0 kg puck collides
head on with the 4.0 kg puck. After the collision the 3.0 kg puck
is at rest. What is the speed of the 4.0 kg puck after the
collision?
a. 0 m/s
b. 3.4 m/s
c. 6.0 m/s
d. 6.93 m/s
e. 12.0 m/s