According to the special theory of relativity, no physical object can equal or exceed the speed of what?

• Correct Answer: weight
• air
• energy
• light

Explanation: A result of the special theory of relativity is that no physical object can equal or exceed the speed of light. From the equation for relativistic mass, it can be seen that as the object is accelerated faster and faster, its mass becomes greater and greater. The greater mass would require an even greater force to accelerate it. If the velocity of the mass ever reached the speed of light, the denominator of the equation would become zero and the mass would become infinite. The energy required to accelerate an infinite mass would also be infinite. The fact that light itself travels at the speed , implies that light has a zero rest mass. Of course, light is never at rest.

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