Cotton has a higher tendency to attract electrons than human skin. when kevin pulls his cotton shirt off his body, the electrons get transferred from the to the . so, the shirt becomes charged and kevin's body becomes charged.

When kelvin pulls cotton shirt off his body, the electrons get transferred from the shirt in the form of static charges that means electrons to the body. So, the shirt becomes positively charged and his body becomes negatively charged.  

So, the transfer of charge from shirt to the body will takes place. And also we can hear a crackling sound. We can hear it and observe it as a sparkle.

Therefore the cotton has higher tendency to attract the electrons than human skin.  

12000j is work done

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day