The government or supreme leader
<span>1 molecule N2 x (28.0 g / 6.02 x 10^23 molecules) = 4.65 x 10^-23 g = 4.65 x 10^-26 kg/molecule 1. KE = 1/2 m v^2 = 0.5 x 4.65 x 10^-26 kg x (469.4 m/s)^2 = 5.12 x 10^-21 J/molecule 2. ... kinetic energy=(1/2)m*speed^2</span>
Well when people didn't have trucks and cars and things so they had to use the canals and rivers to transport trade.
hope it helllps ;)
