Conservation of Energy

Conservation of Energy states, "Energy cannot be created or destroyed. It can only be transmitted."

• True

• False

• TBD

• Fourth option here

A 28 kg child on a swing is traveling at 4.2 m/s and has 315 J of total mechanical energy. What is his height?

• 247 m

• 2.43 m

• 68 m

• 0.25 m

A 1.8 kg book has been dropped from the top of the football stadium. It's speed is 4.5 m/s when is 2.9 meters above the ground. What is the total mechanical energy?

• 21 J

• 72 J

• 51 J

• 30 J

A 1.8 kg book has been dropped from the top of the football stadium. It's speed is 4.5 m/s when is 2.9 meters above the ground. What is the height of the stadium?

• 4.1 m

• 1.2 m

• 3.5 m

• 5.7 m

A 1.8 kg book has been dropped from the top of the football stadium. It's speed is 4.5 m/s when is 2.9 meters above the ground. How fast will the book be moving as it hits the ground?

• 80 m/s

• 9.4 m/s

• 8.9 m/s

• 94 m/s

Identical twins Rick and Chris are painting a house. Rick is standing on a ladder 5 meters above the ground. Chris is standing on a ladder 3 meters higher than Rick. Who has more gravitational potential energy?

• Rick

• Chris

• They have the same.

• Neither has GPE.