A 5 g beetle sits on the left end of a 30 cm light plank whose pivot is located at its center. Where on the plank should we place a 10 g grasshopper to balance it?

A.) =22.5cm

B.) Now assume we place the grasshopper on the right end of the plank. Where should the pivot be for the plank to be balanced? (Report the distance as measured from the left end of the plank and use cm.)