A mass of 150 g stretches a spring 1.568 em. If the mass is set in motion from its equilibrium position with a downward velocity of cm 20 , and if there is no damping, determine the position u of the mass at any time t. NOTE: Assume g-9.8 and enter an earect anser. u(t) When does the mass first return to its cquilibrium position? NOTE: Enter an cract ansuer.

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