an 80-kg man is sitting on the right side of the plank, 1.25m away from the fulcrum. While on the left side of the plank, a 30-kg girl and a 20-kg boy are both seated 2.00 and 1.75m away from the fulcrum, respectively. A mystery object C is also placed on the left side of the plank with a lever arm of 1.0m. To make the system in equilibrium, another mystery object A is placed on the right side of the plank, 0.5m away from the fulcrum.  Use the second condition for equilibrium to find the Torques of objects A and C.

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Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.