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A mass of 68g stretches a spring 13cm. The mass is set in motion from its...

A mass of 68g stretches a spring 13cm. The mass is set in motion from its equlibrium position with a downward velocity of 13cm/s and no damping is applied.

  1. Determine the position u of the mass at any time t. Use 9.8m/s2 as the acceleration due to gravity. Pay close attention to the units.u(t)= m
  2. When does the mass first return to its equilibrium position?t=
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