2 In an experiment, a student takes measurements and determines the extension of a sprin different loads. The apparatus is shown in Fig. 2.1. spring 100000 000 0000 X scale load Fig. 2.1 The table in Fig. 2.2 shows the results. load/N 0 1.0 2.0 3.0 4.0 5.0 length of spring/mm 200 235 270 305 350 420 extension/mm 0 35 70 105 Fig. 2.2 (a) Only some of the extensions are shown in the table. Complete the table to show all of the extensions. (b) Calculate the load that produces an extension of 49 mm