A 250 g sticky hockey puck slides along a frictionless, horizontal ice surface at 75 m/s in the +x direction. It collides with a 500 g sticky puck originally sliding at 25 m/s in the -y direction. They collide perfectly inelastically. How much kinetic energy is lost in this collision?
A) 521 J
B) 779 J
C) 520 J
D) More information is needed

Question

Quizplus · Accepted Answer

The initial kinetic energy is calculated for both pucks separately and then summed. The final kinetic energy is calculated using the combined mass and velocity after the collision. The difference between the initial and final kinetic energy gives the energy lost.

A 250 G Sticky Hockey Puck Slides Along a Frictionless