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m=2 kg
t=10s
F=1N
Ek=mv²/2
F=ma
a=F/m
v=at
v=F/m *t
V=1N/2 kg *10 s
V=5m/ s
Ek=2 kg*(5m/ s)²/2
Ek=2 kg*(25m²/ s²)/2
Ek=1kg*(25m²/ s²)
Ek=25J