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Mass vs Weight

In the figure...

Question

In the figure shown, with what force must the man pull the rope to hold the plank in position? Weight of the man is 80 kg-f. Neglect the weights of plank, ropes and pulleys.

A

40 kg-f

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B

50 kg-f

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C

80 kg-f

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D

20 kg-f

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Solution

The correct option is D 20 kg-f
4T = 80 Kg-f
T = 20 Kg-f

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