Someone has played a practical joke on you, and your favorite chair is stuck at rest in the middle of a frozen pond that is completely frictionless. Trying to help you out, I push out a 5 kg rock horizontally at 4 m/s along the +x direction, which hits your chair. The rock rebounds with a speed of 1 m/s back along the same path it was pushed, and the chair is now slowly moving across the ice at 2 m/s and will eventually reach the edge of the pond. Victory! What is the momentum of the chair in kg*m/s before and after it struck the rock? What is the chairs mass in kg? What was the impluse of the of the rock during the rock/chair interaction in N*s

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