A bullet is fired at at a block of wood that is moving in the opposite direction at a speed of . The bullet passes through the block and emerges with the speed of , while the block ends up at rest.

What is the mass of the block?

Two train cars, each with a mass of 2400 kg, are traveling along the same track. One car is traveling with a velocity of east, while the other travels with a velocity of west. The two cars collide and stick together as one mass. What is the magnitude and direction of the resulting velocity?

In an elastic collision, what combination of quantities is conserved?

In an inelastic collision, which combination of quantities is conserved?

A 200kg car is traveling west at . It collides with a 150kg car that was at rest. Following the collision, the second car moves with a velocity of west. Assuming that the collision is elastic, what is the velocity of the first car after the collision?