A spring with a constant of #12 (kg)/s^2# is lying on the ground with one end attached to a wall. An object with a mass of #8 kg# and speed of #4 m/s# collides with and compresses the spring until it stops moving. How much will the spring compress?
We can use conservation of mechanical energy (no friction) equating the sum of (elastic) potential energy
before (spring relaxed=zero pot energy and object moving with velocity
after (spring compressed of length