We can calculate momentum by using the equation:
Momentum = Mass × Velocity
When a system is not affected by any external forces, the total momentum before an event is equal to the total momentum after the event. We call this conservation of momentum.
A van with a mass of 2,000 kg is travelling at 25 m/s. It collides with a stationary car, which has a mass of 1,200 kg. After the collision, the two cars move together.
Calculate the velocity of the van and car together after the collision.