105. A box of mass 4 kilogram is pushed on a rough ( u = 0.2 ) heavy trolley with an acceleration 2 m/s relative to trolley. If the trolley moves with an acceleration of 3 m/s on the ground, the work done in pushing the box for 2s is (1) 60J (2) 120J (3) 180J (4) 280J

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