Two persons of masses 55 kg and 65 kg respectively, are at the opposite ends of a boat. The length of the boat is 3.0 m and it weighs 100 kg. The 55 kg man walks up to the 65 kg man and sits with him. If the boat is in still water the centre of mass of the system shifts by

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(3) zero. Given: 55 kg and 65 kg on a 100 kg boat, L=3.0 m, still water. Idea: the water is still and frictionless, so no external horizontal force acts on the man-plus-boat system. ⃗Fₑₓₜ=M⃗a_cm=0, and the system starts at rest. A centre of mass that starts at rest with zero external force stays exactly where it is. The man and the boat each move, in opposite directions, but the shift of the centre of mass is zero.

Two persons of masses 55 kg and 65 kg respectively, are at the opposite ends of a boat. The length of the boat is 3.0 m and it weighs 100 kg. The 55 kg man walks up to the 65 kg man and sits with him. If the boat is in still water the centre of mass of the system shifts by

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