Incorrect

Well Done!

*PE*_{elastic} =
1 over 2
1
2
*kx*^{2}

Correct!

Law of Conservation of Energy Equation

Correct!

*KE*_{1} + *PE*_{1} = *KE*_{1} + *PE*_{1}

Correct!

*ME* = *KE* + *PE*

Correct!

A 100 kg rock is sitting at the top of a hill at a height of 100 m.

Correct!

A 20 kg car is moving at a rate of 50 m/s.

Correct!

Mechanical Energy Equation

Correct!

*PE*_{g} =
*mgh*

Correct!

*KE* =
1 over 2
1
2
*mv*^{2}

Correct!

Potential Energy Elastic Equation

Correct!