The extension of a spring (s s\,s mm) is directly proportional to the weight (w w\,w kg) attached to it.
s s\,s is given by the formula: s=4.5ws = 4.5ws=4.5w
Find the weight attached when the spring has an extension of 36 mm.
50 exam-style questions on AQA GCSE Maths Direct and Inverse Proportion. Each one has a worked solution and a mark scheme showing where the marks go.