A massless spring has unstretched length Lo = 0.45 m and spring constant k = 122.3 N/m. A block of mass m = 1.87 kg
is attached to the spring, and a student stretches the spring to a length of L = 1.1 m. Then the student releases the block and it shoots upward.
What is the speed of the block when it returns to the position Lo for the first time?
Use gravity = 9.81 m/s2.
|v| = m/s