The boy is sitting in a moving tram. He rests relatively …

The state of rest is relative. We can sit still and rest in relation to the chairs. But we are moving relative to a passing car on the street. Also, inside us there are movements of substances, movements of atoms, therefore we cannot be in a state of rest in any way. But if we take the organism as a whole, then it can be in a state of rest relative to other objects. In our case, the boy is at rest relative to the tram window. But with respect to trees and another tram, he is in a state of motion.