Group Problem Solving

Puck collision

In this situation, momentum is conserved but kinetic energy is not.

P_{i} = m_{B} v_{B} + m_{A} v_{A}

P_{f} = m_{A} v_{A f} m_{B} v_{B f}

P_{i} = P_{f}

m_{B} v_{B} + m_{A} v_{A} = m_{A} v_{A f} + m_{B} v_{B f}

v_{B f} = \frac{m _{B} v _{B} + m _{A} v _{A} - m _{A} v _{A f}}{m _{B}}

v_{B f} = \frac{2.4 ( 5 ) + 1.2 ( - 8 ) - 1.2 ( - 1 )}{2.4}

v_{B f} = 1.5 m / s