Practice 1. Determine the net force acting on each of the following objects. In each case assume that all forces acting on the object are given. ( in (a) At an instant when a soccer ball is slightly off the ground, a player kicks it, exerting a force of 25 N at 40.0 above the horizontal. The force of gravity acting on the ball is 4.2 N [down]. fans: 23.N (32* above the horizontal]] (b) Two children pull a sled across the ice. One child pulls with a force of 15 N [N 35' E]. and the other pulls with a force of 25 N [N 54' W]. There is negligible friction acting on the sled. [ans: 29 N [N 23* W]) (c) In a circus act, a performer with a force of gravity of 4.4 x 10 N on her is lifted by two different ropes at the same time. One rope exerts a tension of 4.3 x 10 N [up and 35' left). and the other rope exerts a force of 2.8 x 102 N [up]. [ans: 3.1 x 10' N [up 28" lott]]