# If the length of a #24 cm# spring increases to #47 cm# when a #5 kg# weight is hanging from it, what is the spring's constant?

##### 1 Answer

Better to rewrite the question in metres: "

#### Explanation:

The spring constant,

It's important to use correct SI units for the quantities: centimetre is not a base SI unit, metre is, so convert the

I used

The force acting on the spring is the weight force of the mass, which is its mass,

Calculating all this leads to a spring constant equal to