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a=F/m
a=v/t
v/t=F/m
F*t=v*m /:t
F=v*m/t
dane:
v=2000m/s
m=0.2kg
t=2s
rozw:
F=2000m/s*0.2kg:2s [m/s*kg*1/s=kg*m/s²=N
F=200N
odp:sila ciagu silnika wynosi 200N