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2. Consider a point mass of In moving in one dimension under a force of F = kx3. (a) Show that the energy of the

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2. Consider a point mass of In moving in one dimension under a force of F = kx3. (a) Show that the energy of the mass is conserved during the motion. What's its potential energy? (5 pts) (b) If the mass was originally at rest and at x=A. What's its velocity at x= A/2'? (5 pts)

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