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The idea here is to assume that all the kinetic energy was originally (when the stone was at its highest point) gravitational potential energy. So, all you need to do is use the equation for gravitational potential energy, replace the numbers you know, and solve it for mass.

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energy is 9.8 joules or 9.8 newton-meters. at 2 meters weight is 9.8/2 = 4.9 Newtons. Mass is weight/9.8 (weight/gravity acceleration) so m = 4.9/9.8 = 0.5 kilogram

Q: Anne releases a stone from a height of 2 meters. She measures the kinetic energy of the stone at 9.8 joules at the exact point it hits the ground. What is the mass of the stone?

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Basically, if it moves, it has kinetic energy. And if it is above ground level, it has gravitational potential energy.

This is actually two questions. Energy relating to the motion of an object is kinetic energy. Energy related to its position is potential energy (as with a brick suspended at some distance above the ground). Release the brick and its potential energy is converted to kinetic energy. The two are complementary. As the brick accelerates toward the ground its kinetic energy increases; as the distance decreases during that acceleration, it's potential energy decreases.

Kinetic energy- the energy of a moving mass.

Calculate the gravitational potential energy between 5 m and 2 m above the ground. If you ignore air resistance, all of that potential energy will be converted to kinetic energy, so that's the answer.

Yes and no. When the ball is at its highest point, it is storing potential energy. when it is moving back down, the potential energy turns into kinetic energy, and so forth. But when the ball is done bouncing, it doesn't technically "store" energy.

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Tide = Flow of kinetic energy from higher ground to lower ground Wind = Flow of kinetic energy from higher pressure to lower pressure Electricity = Flow of electrical energy (transfer of kinetic energy) from higher voltage to ground or low voltage.

Once the object has reached the ground, its kinetic energy is zero.

Tide = Flow of kinetic energy from higher ground to lower ground Wind = Flow of kinetic energy from higher pressure to lower pressure Electricity = Flow of electrical energy (transfer of kinetic energy) from higher voltage to ground or low voltage.

Sitting on the table the stone has potential energy, relative to the ground, of weight times height, mgh. It has zero kinetic energy so its total energy is E = 0 + mgh. When it begins falling it loses potential energy (as it loses height) and gains kinetic energy ( as it picks up speed) so the sum stays the same as initially E = KE + PE = mgh. Just before it hits the ground all of its potential energy is gone and has been transformed into kinetic energy. So the kinetic energy at the bottom (1/2)mv^2 will equal the potential energy at the top.

An excited electron releases a photon as it returns to ground state.

Basically, if it moves, it has kinetic energy. And if it is above ground level, it has gravitational potential energy.

Kinetic energy is dependent on which point you are talking about. When it is about to be dropped, kinetic energy is zero. When it reaches almost hits the ground, there is maximum kinetic energy.

Potential, changing to kinetic when you release it and it falls.

Heat, sound and more kinetic energy as things are moved by the impact of the object.

Potential and kinetic energy are sort of like inverses. They are not technically inverses strictly speaking in the mathematical sense. Potential energy can become kinetic energy, and vice versa. Keep in mind the mathematical concept of the change in each. (change in) Potential energy= (change in) Kinetic energy. For example, let's say that we had a mass of 1 kg suspended 1 metre above the ground. If we drop it, its kinetic energy by the time it hits the ground is (1/2)mv2 . (1/2)(1kg)(9.82 ) (m2 ) or 48.02J It's potential energy at this point is 0, because it is on the ground and is not suspended in the air. Potential and kinetic energies act as inverses because before the mass was dropped its kinetic energy was 0 and its potential energy was 48.02J. By the time the mass had dropped to the ground however, the potential energy had all transferred into kinetic energy.

This is actually two questions. Energy relating to the motion of an object is kinetic energy. Energy related to its position is potential energy (as with a brick suspended at some distance above the ground). Release the brick and its potential energy is converted to kinetic energy. The two are complementary. As the brick accelerates toward the ground its kinetic energy increases; as the distance decreases during that acceleration, it's potential energy decreases.

From gravitational potential energy to kinetic energy and if you want it until it drops onto the ground , (continue from kinetic energy) heat energy + sound energy.