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13. Which of the following statements is/are true about mechanical energy?
I. Heat is a form of mechanical energy.
II. The mechanical energy of an object is always conserved.
III. Mechanical energy of a system is simply the sum of its kinetic and potential energies.

A. I only B. I and II only C. II and III only D. I, II and III​


Sagot :

Answer:

c.II and III

Explanation:

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