The World Today - Comment
**Question 320: Which of the following is not a formula for energy?**
*Author: funxus - Category: Science* Difficulty: 4/5 - Zone: World
(mv²)/2 (where m is mass, and v is speed) hf (where h is Planck's constant, and f is frequency)
**ma (where m is mass, and a is acceleration)** mc² (where m is mass, and c is the speed of light)
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