Listen to what the conference participants say about their countries. Try to guess which country they are from. Say why you think so. Example: Alison is from I think so because, she...

E=Eк+Eп
Eк= m*v^2/2=(100000*40000)/2=2*10^9 Дж
Eп= m*g*h=100000*10*1=1*10^9 Дж
E= 2*10^9+1*10^9=3*10^9 Дж