Two Children Seat Themselves on a Seesaw

Two children seat themselves on a seesaw.The one on the left has a weight of 300 N while the one on the right weighs 200 N.The fulcrum is at the midpoint of the seesaw.If the child on the right is not at the end but is 1.50 m from the fulcrum and the seesaw is balanced,what is the torque provided by the weight of the child on the left? (Take ccw as positive. )

A) -300 N·m
B) 300 N·m
C) 450 N·m
D) -450 N·m
E) ​150 N·m

Correct Answer:

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