(b) Anna says Because I stopped for drinks, my average running speed was faster than 6 kilometres per hour. Give one reason to support Anna's statement. __ [1] ........... 16 The volume of a piece of wood is 620cm^3 Its density is 0.85g/cm^3. Work out its mass.

(b) This question is trying to understand if one can reason why taking a break for drinks might make someone's average running speed faster than 6km/hr. We can infer that because Anna took a break for drinks, she rehydrated and regained some energy, which allowed her to maintain or increase her speed during the run. Therefore, stopping for drinks would increase her average speed rather than slowing her down. 16. This is a problem about the physical concept of density. The formula we use to find the mass is density equals mass over volume. So, mass equals density times volume. Given that the volume of wood is 620 and the density is , if we multiply these values, we can find the mass.