9) In a 4th period battle, the girls were able to overcome the in Tug-of-War. Ten boys each pulled with a force of 30 N. Six girls were able to pull the rope toward them with a net
force of 60 N. What was the minimum amount of force each of the six girls applied to the
rope?

Aball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. if the ball hits the floor with a speed of 2.40 m/s and rebounds with a speed of 1.70 m/s, determine the following. (a) magnitude of the change in the ball's momentum (let up be in the positive direction.)