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A frictionless air puck of mass 300 g is travelling at 3.2 m/s in the direction...

A frictionless air puck of mass 300 g is travelling at 3.2 m/s in the direction 0°. It collides with a 500 g frictionless air puck which was travelling at 2.6 m/s in the direction 75°. After the collision, the 500 g puck ends up travelling at 2.1 m/s in the direction 10°. What is the velocity of the 300 g puck after the collision? Give the magnitude and the direction.

In a collision between two objects where the objects only interact with each other, is momentum sometimes or always conserved, and is kinetic energy sometimes or always conserved? If it is sometimes, be clear on when it is conserved.

When using the formula K1+U1+Wnc = K2+U2, we do not include the work done by gravity or a spring in the term Wnc. Why not? Doesn’t that leave out the effect of those forces? I am looking for two parts to the answer.

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