Two 2.4 kilograms pieces of putty collide and stick together, yielding a single 4.8 kilogram piece. The first piece of putty has a velocity of 4.5 m/s to the right, and the second piece of putty has a velocity of 4.5 m/s to the left. What is the velocity of the system after the collision? A. 4.5 m/s (to the right) B. 2.25 m/s (to the left) C. 2.25 m/s (to the right) D. 0.0 m/s How much kinetic energy is lost (i.e. converted into heat, light, sound, and other forms) over the course of the collision described in question #2? A. 0.0 Joules B. 24.3 Joules C. 48.6 Joules D. 68.6 Joules

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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.