physics

A block of mass 4kg hangs from a spring of force constant 400N/m.the block is pulled down 15cm below the equilibrium position and released. Fimd: a) amplitude, frequency and period of vibration. b) kinetic energy when the block is 10 cm above the equilibrium position. c) time it takes the block to go 12 cm below the equilibrium pOsition on the way up to 9 cm above the equilibrium position

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asked by Ailen
  1. a) are not these standard formulas?
    b) You know total energy from the amplitude, and at 10 cm, you know from the force equation the PE, so then you know Ke
    c) use the displacement equation to figure time for each position, the difference in time is the time taken.

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