成都职业洋遛狗:physics(a litte comfusing)

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a light string joins two objects of masses 2kg and 4kg. The object of mass 2kg is on a smooth horizontal table and the 4kg object hangs over the edge of the table. What is:
(a) the tension in the string;
(b) the acceleration of the objects?

a) T=4kg*9.8N/kg=39.2N
b) 9.8N/kg

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