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MULTIPLE CHOICE!!!!!!!
If no friction acts on a diver during a dive, then which of the following statements is true?
A. The total mechanical energy of the system increases.
B. Potential energy can be converted into kinetic energy, but not vice versa.
C. total energy to start is the same as total ending energy
D. all of the above

Answer :

If no friction acts on a diver during a dive, then total energy to start is the same as total ending energy.

In short, Your Answer would be Option C

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Answer:

C. total energy to start is the same as total ending energy    

Explanation:  

According to law of conservation of energy, the total energy is always conserved. The energy can change form but cannot be created or destroyed. The diver would have the same energy at the beginning and the end if no friction acts because then there would be no dissipation of energy as heat. The total mechanical energy would also be conserved i.e. potential energy and kinetic energy can be converted into each other.

Correct option is C.

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