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Obtain the equation of motion for a 1.25-g mass, at the end of a perfectly elastic...

Obtain the equation of motion for a 1.25-g mass, at the end of a perfectly elastic spring which, when stretched 3.75 cm from equilibrium and then released from rest, undergoes simple harmonic motion with a period of 0.016667 s. B.) Find the (i) spring constant (ii) maximum velocity and (iii) total energy of the mass. C.) For the above spring find the positions for which the potential energy is one-third the kinetic energy.

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