1) State Hooke's law and write the equation for the spring system upto the limit of proportionality. 2) Write the mathematical relationship between Mass (in kg), Weight (in N) and acceleration due to gravity (g). 3) Sketch and label a graph of extension (AI) against Weight (W) including the limit of proportionality and beyond this point. 4) Show how you can work out the value of spring constant (k) from the graph.