With what force must the man pull the rope to hold the plank in position, as shown in the figure? Weight of the man is 60 kg. Neglect the weights of plank, rope, and pulley.
Text Solution
Verified by ExpertsThe correct answer is:
A
If 
is the required force and 
is the contact force, then
For the man: 
…(i)
For the plank: 
…(ii)
On adding Eqs. (i) and (ii), we get
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