A person walks on Earth in a straight line, he says he is walking with uniform velocity. But I (from space) see him walking on a curved surface and say that he must be accelerating since he is actually walking on a curved path.
Therefore the person is accelerating in one reference frame and not in other but this contradicts General Relativity which says that acceleration is absolute and not relative.
What does the statement ‘acceleration is absolute’ actually mean? What have I assumed wrong?