MCQ practice · SSC Physics Board questions · Chapter 4: Work, Power and Energy
By which law is it possible to convert the mass of an object into energy?
Think it through first, then pick an option.
- a E = ½mv²
- b E = mgh
- c E = mc²
- d F = ma
Answer and explanation
Correct answer: c E = mc²
Einstein's equation E = mc² relates mass and energy. ½mv² is kinetic energy, mgh is potential energy and F = ma is the law of force.
Why the other options are wrong
- a E = ½mv²: This is not the answer: Einstein's equation E = mc² relates mass and energy. ½mv² is kinetic energy, mgh is potential energy and F = ma is the law of force.
- b E = mgh: This is not the answer: Einstein's equation E = mc² relates mass and energy. ½mv² is kinetic energy, mgh is potential energy and F = ma is the law of force.
- d F = ma: This is not the answer: Einstein's equation E = mc² relates mass and energy. ½mv² is kinetic energy, mgh is potential energy and F = ma is the law of force.
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