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v=20m/s
t=10s
a=20/10=2m/s²
F=am=1000*2=2000N=2kN
v=72 km/h=20 m/s
t=10s
p=mV
p=20 m/s * 1000= 20000 kg*J
F=p/t = 20000/10= 2000N