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NL11-001
Two boxes, P and Q, resting on a rough horizontal surface, are connected by a light inextensible string. The boxes have masses 5 kg and 2 kg respectively. A constant force F, acting at an angle of 30o to the horizontal, is applied to the 5 kg box, as shown below.
The two boxes now move to the right at a constant speed of 2 m∙s-1.
