1. Convert the units in the following statements into S.I. units.

(i) A hot air balloon descends at $5.94\times{10}^{5}cm{h}^{-2}$.

(ii) The density of oil is about $0.95g{cm}^{-3}$.

(iii) The average spike ball player can hit the ball at a velocity of $43.5km{h}^{-1}$.