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Ek= 1/2 x m x vkuadrat.
64J = 1/2 x m x 16
64/8 = m
8kg = m
2. Ek= 1000J, m=80kg. v?
ek = 1/2 x m x v2
1000 = 1/2 x 80 x v2
1000 = 40 x V2
25 = v2
akar 25 = v
5 m/s = V
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