F is the lifting force
f is the frictional force
M is the mass of the drone
m is the mass of the load
a is the acceleration.
Apply Newton's second law and assume that Y-axis looks upward:
F−mg−Mg−f=(M+m)a,f=F−(m+M)g−(M+m)a==F−(M+m)(g+a)=180−(5.8+3.2)(9.8+0.9)=83.7 N.
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