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physics

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A 215 g mass is attached to a spring and executes simple harmonic motion with a period of 0.250 s. If the total energy of the system is 2.30 J.
(a) Find the force constant of the spring.
135.81 N/m
(b) Find the amplitude of the motion.

i just need help with what equation i should use. im stumped on this question.

  • physics -

    The period is

    P = 2 pi sqrt(k/m)
    Use that and the mass to get the spring constant, k.

    The total energy of the system is
    (1/2) k X^2 = 2.30 J,
    where X is the amplitude. .

    Knowing that and k, solve for X.

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