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Elastic Potentional Energy is with the second answer

Mechanical Energy is with the last answer

Gravitational Potential Energy is with the first answer

Explanation:

Sorry this took so long it was a bit hard to remeber at first but I got it :)

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Gravitational potential energy is energy of an object because of its hieght above the surface

mechanical energy is energy of an object because of it's potential and kenetic energy

elastic potential enrgy is energy stored in a compressed or streched object

Explanation: Hope this Helps!

a sonic boom is a loud boom that breaks the sound barrier

explanation:

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures