# A 3.0 kg mass moving to the right at 1.4 m/s collides in a perfectly inelastic collision with a 2.0 kg mass initially at rest. What will the velocity of the combined mass be after the collision?

##### 1 Answer

When analyzing inelastic collisions, we need to consider the law of **conservation of momentum**, which states that the total momentum,

In our case we only have two masses, which makes our problem fairly simple. Lets plug in the formula for momentum;

To find the velocity of the combined mass we simply rearrange the terms.

Plug in the values given in the problem.