Under what conditions would a rope remain in equilibrium during a tug of war? a) when there is no force acting on the rope. b) when the net force acting on the rope is zero. c) when the forces acing on the rope are unbalanced. d) when the forces are equal in magnitude and direction.

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.)