75 m long.

a 3.50 x 10^2 N child is in a swing that is attached to ropes 1.75 m long. find the gravitational potential energy associated with the child relative to her lowest postion when a) the ropes are horizontal, b) the ropes make a 30.0 degree angle with the vertical, and c) the child is at the bottom of the circular arc.

 

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