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Ek= 60 kilojoule --> 60x1000= 60000 Joule
v= 20 m/s
Dit:
m=..?
Penye:
Ek= 1/2.m.v²
1/2.m.v²= Ek
1/2×m×20²= 60000
1/2×m×400= 60000
200×m= 60000
m= 60000/200
m= 300 kg