Hi, i am given a question that states;

A spring is 20cm long when a load of 10N is hanging from it, and 30cm long when a load of 20N is hanging from it.

Draw diagrams and work out the length of the spring when;

a) there is no load on it

b)there is a load of 5 N on it.

can someone explain to me how to arrive at the answer??

any assistance would be greatly appreciated!

thank you!