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90 N is the right answer
sailesh28:
how. explain with steps plz
total wt/no. of strings=180/2=90N
the ans is correct but ur step is wrong
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internal tension T= ext force F.
As pulley is massless draw FBD of mass 18 kg.
2T = 180
=> T = 90 N
So ext force F= 90 N
As pulley is massless draw FBD of mass 18 kg.
2T = 180
=> T = 90 N
So ext force F= 90 N
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