# Physic (store energy)

Question three
Two masses of 2 kg and 4 kg are held with a compressed spring between them. If the masses are released,
the spring will push them away from each other. If the smaller mass moves off with a velocity of 6m/s,
what is the stored energy in the spring when it is compressed? Asume there is no external force.

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1. momentum is conserved

so the larger mass will have a velocity of 3 m/s

the sum of the kinetic energies of the two masses, is the energy stored in the spring

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2. i want to know the answer first

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3. The total kinetic energy of two masses is equal to the store energy of the spring..

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4. momentum is conserve, therefore 18j+36j=54j

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