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A mass of 100 g stretches a spring 5 cm. If the mass is set in...

A mass of 100 g stretches a spring 5 cm. If the mass is set in motion from its equilibrium position with a downward velocity of 10 cm/s, and if there is no damping, determine the position u of the mass at any time t. (Use g = 9.8 m/s2  for the acceleration due to gravity. Let u(t), measured positive downward, denote the displacement in meters of the mass from its equilibrium position at time t seconds.)

u(t) =

When does the mass first return to its equilibrium position?

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