What technique is used by all three branches of science to make discoveries

Abumper car with a mass of 250 kg is traveling at a speed of 4 m/s. this bumper car collides and sticks to a second bumper car with a mass of 250 kg, which is initially at rest. what is the final speed of these two bumper cars after the collision, assuming they remain stuck together?

Complete the sentence to describe the law of conservation of energy. the law of conservation of energy states that energy cannot be created

What types of radiation make up the electromagnetic spectrum?