# Homework Help: Momentum hw

1. Nov 14, 2008

### ash89

1) A bullet of mass 0.65 kg is fired from a 4.0 kg gun with a speed of 5.0 x 10^2 m/s. What is the recoil velocity of the gun?

2) A 62 kg child is sitting on a wagon full of bricks that has a mass of 150 kg. In order to move the wagon without touching the ground, the child throws bricks, each of mass 3.0 kg, in the direction opposite to the direction the wagon is to go. How fast will the wagon move if the bricks are thrown at 2.0 m/s?

3) A 900 kg car moving west at 20 m/s hits a 1200 kg car moving north at 10 m/s. After the collision, the cars stick together in an inelastic collision. Calculate the exact direction and speed of the cars after the collision.
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Nov 14, 2008

### joeyar

Attempt at a solution? You can not expect to be given the answer if you've made no attempt to solve the problem yourself.