14. A helical spring is hung from the edge of a bench top, as shown in Fig. 2.1.
bench top

Before the load is hung on the spring, the pin points to the 29.8 cm mark on the meter rule.When a load of 5.5 N is hung on the spring, the pin points to 62.8 cm.

a. Calculate the extension of the spring.
b. The law relating extension to load is given by the equation load = constant × extension.

I. Calculate the numerical value of the constant.
ii. Suggest a suitable unit for the constant.