If humans are the most complex creature, does that mean they have the most number of chromosomes?

Yes. Either way though, humans have more chromosomes than any other species.

No. Humans only have 46. Apes have 48.

It starts from rest meaning the initial velocity is 0

is accelerates at 5.7m/s^2 meaning a = 5.7m/s^2

t = 7.2s

vf = vi + at 

vf = final velocity
vi = initial velocity 
a = acceleration 
t = time 

we are looking for the final velocity 

vf = vi + at 

vf = 0 + (5.7 * 7.2)

vf = 41.04 m/s  This is your answer