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20 May, 13:22

Select Earth in the menu box so that there is now a force of gravity. Now the total energy of the weight/spring/Earth system is the sum of the kinetic energy, the elastic potential energy, and the gravitational potential energy. When is the kinetic energy a maximum?

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  1. 20 May, 16:36
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    When the mass is at the equilibrium position. The total potential energy (the gravitational potential energy plus elastic potential energy) is a minimum at the equilibrium position, even though there is some elastic potential energy when the mass is at this location. The kinetic energy is always a maximum when the total potential energy is a minimum (since the total energy is conserved).
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