Hello!
In this case, as the meanings of the vectors are opposite, one of the forces receives the negative signal. And to know the module of the resultant force, if it subtracts the modules of the forces.
\(F_{Net} = F_{grav} - F_{air}\)
\(F_{Net} = 600 - 400\)
\(\boxed{\boxed{F_{Net} = 200N}}\end{array}}\qquad\checkmark\)
Answer:
B. 200N
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I Hope this helps, greetings ... Dexteright02! =)
