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Question
An object has 0 momentum, does it have energy? Explain your answer.
An object has 0 momentum, does it have energy? Explain your answer.
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Solution
The total kinetic energy is the sum of the two momenta. Because the momenta are "equal but opposite", the sum of momenta is zero. An object can have zero momentum when either its mass or its velocity is zero. Since negative mass doesn't exist, the velocity should be zero and thus, the object must be at rest.
The total kinetic energy is the sum of the two momenta. Because the momenta are "equal but opposite", the sum of momenta is zero. An object can have zero momentum when either its mass or its velocity is zero. Since negative mass doesn't exist, the velocity should be zero and thus, the object must be at rest.
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