# How much energy is released in a head-on collision between two railroad cars?

## What is the total energy released in the collision?

Is there any energy released in a head-on collision between two railroad cars?

## The total energy released in the collision is zero.

No energy is released in a head-on collision between two railroad cars.

The collision between the two railroad cars can be analyzed using the principle of conservation of momentum.

First, we need to determine the initial momentum of the system. The momentum of an object is given by the product of its mass and velocity. Since the two railroad cars are traveling toward each other, their velocities are of equal magnitude but opposite in direction. Therefore, the initial momentum of each car is given by:

Initial momentum = mass × velocity = 56000 kg × 90 km/h

To calculate the total initial momentum of the system, we need to consider the direction of motion. Since the velocities of the cars are opposite, we can subtract one momentum from the other:

Total initial momentum = (56000 kg × 90 km/h) - (56000 kg × 90 km/h)

The next step is to determine the final momentum of the system. Since the cars come to rest after the collision, their velocities become zero. Therefore, the total final momentum of the system is also zero.

According to the principle of conservation of momentum, the total momentum before the collision must be equal to the total momentum after the collision. So, the energy released in the collision is zero. This means that no energy is released in this head-on collision.

In conclusion, the answer to the question is that zero energy is released in the collision between the two railroad cars.