# If the length of a #78 cm# spring increases to #108 cm# when a #6 kg# weight is hanging from it, what is the spring's constant?

##### 1 Answer

Jul 18, 2018

#### Explanation:

**Given:** a spring stretches from 78 cm to 108 cm when a weight of 6 kg is place on it. What is

**Hooke's Law:**

where

The key to this problem is to make sure the units are correct. Force is measured in Newtons (N).

This means we need units of

Find distance stretched in meters:

Find the force exerted on the spring: