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A frictionless spring with a 5-kg mass can be held stretched 0.8 meters beyond its natural...

A frictionless spring with a 5-kg mass can be held stretched 0.8 meters beyond its natural length by a force of 90 newtons. If the spring begins at its equilibrium position, but a push gives it an initial velocity of 1.5 m/sec, find the position of the mass after t seconds.

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