5 A sphere of mass 12 g is allowed to fall from rest in a tank containing a liquid of density 1600 kg m '. Figure 5 shows the graph of velocity, v, against time, t, for the falling sphere. 0.3 0.2 v/ms=1 0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 t/s Figure 5