28 In a laboratory experiment to determine the force constant of a spiral spring.
the mass or, the spring was varied and the corresponding extensions were
Measured and recorded as shown in the table below.
Mass M/g
Weight W/N
50
100
150
200
250
Extension
e/cm
6.5
11.0
15.0
20.0
25.0
(1) Copy and complete the table. (Take g = 10 ms ²)
(ii) Plot a graph with weight, W, on the vertical axis and extension, e, on the horizontal
axis.
(iii) Using the graph, determine the force constant of the spring.
(iv) Determine the natural length of the spring if its length was 38.0 cm when loaded
with 250 g mass.