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a=1000N:1200kg
a=0,83m/s²
W=Fs
s=v₀t+at²/2
s=10m/s×10s+0,83m/s²×100s²:2
s=100m+41,5m
s=141,5m
W=1000N×141,5m
W=141500J≈142kJ