Conservation of Linear Momentum Practice Test

Two carts on a frictionless track are connected by a compressed spring. Cart 1 has mass $0.40,\text{kg}$ and Cart 2 has mass $0.60,\text{kg}$. The system is both carts, and external forces are negligible. When released, Cart 1 moves left at $3.0,\text{m/s}$. What is Cart 2’s velocity?

Two carts collide on a frictionless track. Cart X ($2.0,\text{kg}$) moves east at $1.5,\text{m/s}$ and Cart Y ($1.0,\text{kg}$) moves west at $0.50,\text{m/s}$. The system is both carts; external forces are negligible. What is the system’s total momentum after the collision?