Problem: On a frictionless horizontal air table, puck A (with mass 0.249 kg ) is moving toward puck B (with mass 0.371 kg ), which is initially at rest. After the collision, puck A has velocity 0.123 m/s to the left, and puck B has velocity 0.646 m/s to the right. A) What was the speed Vai of puck A before the collision? B) Calculate the change in the total kinetic energy of the system that occurs during the collision.

FREE Expert Solution

A) Momentum is conserved:

mavia+mbvib=mavfa+mbvfb

mavia=mavfa+mbvfb-mbvibvia=mavfa+mb(vfb-vib)ma=(0.249)(-0.123)+0.371(0.646-0)0.249

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Problem Details

On a frictionless horizontal air table, puck A (with mass 0.249 kg ) is moving toward puck B (with mass 0.371 kg ), which is initially at rest. After the collision, puck A has velocity 0.123 m/s to the left, and puck B has velocity 0.646 m/s to the right. 

A) What was the speed Vai of puck A before the collision? 

B) Calculate the change in the total kinetic energy of the system that occurs during the collision.