Question

a)work done by 150N force=F.d=150*6=900 J

b)since it is moving with constant speed so acceleration=0

By newtons law

F-f=0

F=f

f=150 N

work done by friction force=f.d=150*6=900 J

c)F-f=0

150-N=0

=150/N

=150/(40*9.8)=.38

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