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v1 = 20 m/s
v2 = 40 m/s
E2 = .......?
E=1/2.m.v^2
m=E/(1/2.v^2)
m=800/(1/2.20^2)
m=4 kg
E2=1/2.m.v^2
E2=1/2.4.40^2
E2=3200 J
800 : Ek2 = V1² : V2³
800 : Ek2 = 20² : 40²
800 : Ek2 = 1 : 4
Ek2 = 4 x 800
= 3200 J
no.2 ...Ek1 : Ek2 = 1/2.m1 .V1² : 1/2 .m.V2²
900 : 3600 = V1² : V2³
1 : 4 = 30² : V2²
V2² = 4 x 30²
V2 = √( 4 x 30² )
V2 = 2 x 30
V2 = 60 m/s