4. Carriage B is loaded with box A as shown in the figure. Find the acceleration of caravan B and box A. 4.รถเลื่อน B บรรทุกกล่อง A มาดังรูป ให้หาความเร่งของรถเลื่อน B และกล่อง A 14, = 0.5 H₂=0.4 B 30 kg 100kg P 70N []

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