what if boy A and boy B pull the heavy cabinet at the same time in opposite directions with 10 N and 5 N of force respectedly, to what direction will it move?

The answer is  the potential energy of the bob at position b is 1.47 joules.if the maximum height of the bob is 0.45 meters when it swings back,1.323   joules of energy was transformed to thermal energy.hope this

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