A mass is attached to a spring, as in Example 6.92. At time t = 0 second,

Question:

A mass is attached to a spring, as in Example 6.92. At time t = 0 second, the spring is stretched to a length of 10 cm below its position at rest. The spring is released, and its length 10 seconds later is observed to be 5 cm. Find a formula for the length of the spring at time t seconds.
Example 6.92