Question three

Question

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.

Answer 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

Answer 2

i want to know the answer first

Answer 3

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

Answer 4

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