(a)[1]
Fig. 1.1 depicts a sealed weather balloon that is at rest in still air. The labels on the diagram are: weather balloon, instruments. State whether the overall density of the balloon and its instruments is greater than, less than, or the same as the density of the surrounding air.
(b(i))[1]
State whether the balloon rises, falls or stays stationary.
(b(ii))[2]
Explain why this happens.
(c(i))[3]
Using the axes in Fig. 1.2, sketch a speed-time graph to represent this motion. The axes show speed on the vertical axis and time on the horizontal axis, with 0 at the origin.
(c(ii))[2]
State the values of the initial acceleration and the final acceleration of the object.