A physics teacher shoots a .30 caliber rifle at a 0.47 kg block of wood. The rifle and wood are mounted on separate carts that sit atop an air track (like a linear air hockey table--ie. Frictionless). The 5.7 kg rifle fires a 27 gram bullet at 227 m/s in the positive direction.
What would be the velocity of the rifle after the bullet is fired?
And, what would be the velocity of the block of wood with the bullet lodged inside?

How much momentum does the bullet have?

Therefore how much momentum does the rifle have?

Therefore what velocity is the rifle travelling at?

What must the momentum of the wooden block + bullet have after impact?

Therefore what is the velocity of the wooden block + bullet after impact?