11) An initially stationary object is pulled with force of F = 50 N as shown up to point B and then force is removed. If the object stops at point C; a) Find the work done by F. b) Find the works done by friction between A-B and B-C points. c) Find the work done by gravitation. F = 50 N UK = 0.2 370 6 kg 12 cm 530 A UK = 0.2 B