Two astronauts masses 40 kg and 120 kg and in need of exercise, leave their spaceship for a game of tug of war. They position themselves one at each end of a 1000 m long massless rope. Then they both pull themselves along the rope with a constant force of 60N. A.) How long does the exercise last before the astronauts meet each other? B.) What is their relative speed when they meet?

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.