# 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?

##### 1 Answer

Nov 8, 2017

#### Answer:

I got

#### Explanation:

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

and

**after** (spring compressed of length

rearranging: