5 A boy of mass 40 kg and a girl of mass 30 kg play on a see-saw of negligible weight. If the boy sits 270 cm from
the pivot of the see-saw, where must the girl sit to make it
balance?

You are standing on a boat. which of the following strategies will make the boat start moving? a. pushing the mast b. throwing some cargo out of the boat c. pushing the front ofthe boat d. pushing another passenger