Question
Puck A (200 g) slides across a frictionless surface to collide with puck B (800 g), initially at rest. The velocity of each puck is measured during the experiment as follows:
Time Velocity A Velocity B
0 +8.0 m/s 0
1.0 s +8.0 m/s 0
2.0 s -2.0 m/s 0
3.0 s -2.0 m/s +2.5 m/s
What is the change in momentum of the center of mass of the system as a result of the collision?
1. $+1.6 \textrm{ kg} \cdot \textrm{m/s}$
2. $+0.8 \textrm{ kg} \cdot \textrm{m/s}$
3. 0
4. $-1.6 \textrm{ kg} \cdot \textrm{m/s}$

(c)

Solution Video