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1. A spring system consists of a stationary spring and a 100-gram mass attached to one end that slides along a horizontal frictionless surface. When a horizontal force of 10.0 N is applied to the mass, the spring stretches 30.0 cm.
a) How much total energy is in the spring?
b) What is the speed of the mass as it passes through a point 15.0 cm from its equilibrium point?
c) What is its speed at the exact instant when it passes through its equilibrium position?
d) Why aren't these speeds in a ratio of 1:2?
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