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dit: v2=...?
EM1 = EM2
EP1+EK1=EP2+EK2
m.g.h1+1/2.m.v1kuadrat=m.g.h2+1/2.m.v2kuadrat
4.10.5+1/2.4.10=4.10.2+1/2.4.v2kuadrat
200+20=80+2 v2kuadrat
200+20-80=2 v2kuadrat
140=2 v2kuadrat
140/2=v2kuadrt
70=v2 kuadrat
v2=akar 70