A say that B is in motion. But C says that B is at rest. Is this possible ?

When can we say that an object is in motion?

How can you say that the tree on the earth is in a state of rest and in a state of motion at the same time?

When can say that circular motion is periodic ?

How do you say that the motion of electrons is affected by the magnetic field?

How can you say that a body is in motion? Is it a common property?

How can you say that a body is in motion? Is it a common property? (AS_(1))

How can you say that a body is in motion? Is it a common property? (AS_(1))