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A stone has initial potential and kinetic energy as 10 J and 5 J respectively if the final potential energy of the stone is 15 J what is its final kinetic energy?

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A stone has initial potential and kinetic energy as 10 J and 5 J respectively if the final potential energy of the stone is 15 J what is its final kinetic energy?

(a) 0

(b) 5 J

(c) 10 J

(d) 15 J

I got this question by my school principal while I was bunking the class.

This intriguing question originated from Internal Energy and Energy Conversion Concept in portion Introduction to Energy Balances for Processes without Reaction and Calculation of Enthalpy Changes of Basic Chemical Engineering

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Correct answer is (a) 0

For explanation: Law of conservation of energy, 10 + 5 = 15 + KE, => KE = 0.

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