A student drops a small metal object into a cylinder of oil. The object falls alongside a vertical ruler and a camera records its position at 1.0s intervals, as shown in Fig. 1.1. [Figure 1.1 shows a vertical ruler in cm with an object falling through oil. Markers indicate the position of the object at different times: - position of object when time t = 0: 0 cm - t = 1.0 s: approx 0.5 cm - t = 2.0 s: approx 1.6 cm - t = 3.0 s: approx 3.0 cm - t = 4.0 s: approx 5.0 cm - t = 5.0 s: approx 7.0 cm] [Figure 1.2 shows a blank grid with y-axis labelled "distance/cm" from 0 to 8 and x-axis labelled "time/s" from 0 to 5.]

1. (a)On the grid in Fig. 1.2, plot a distance-time graph for the object.[2]
2. (b)(i)The object has a constant speed for some of the time. State and explain how a distance-time graph shows that speed is constant.[2]
3. (b)(ii)Explain, in terms of the forces acting on the object, how it is able to fall at a constant speed.[2]

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.