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m = 8 ton = 8.000 kg
v = 72 km/jm
dit : Ek ?
dijwab :
Ek = 1/2 m x v²
= 1/2 x 8.000 x 72²
= 1/2 x 8.000 x 5.184
= 20.737.000 J
= 20.737 KJ