Block A in Fig. 5.64 weighs 1.20 N and block B weighs 3.60 N. The coefficient of kinetic friction between all surfaces is 0.300. Find the magnitude of the horizontal force F necessary to drag block B to the left at constant speed (a) if A rests on B and moves with it (Fig. 5.64a) and (b) if A is held at rest (Fig. 5.64b).

Transcribed Image Text:

(ъ) (a) в B.