Answer:
generators
Explanation:
the machine which turns in a power station
1. The balls move to the opposite direction but the same speed. This represents Newton's third law of motion.
2. The total momentum before and after the collision stays constant or is conserved.
3. If the masses were the same, the velocities of both balls after the collision would exchange.
4 and 5. Use momentum balance to solve for the final velocities.
Im not for sure but i think it takes a couple hundred years (or according to the climate)
