A box of mass 15 kg is kept on the floor of a stationary trolley. The coefficient of static friction between the box and the trolley is 0.12 . Keeping the box in stationary state over the trolley, the maximum acceleration with which the trolley can be moved horizontally in m s -2 is: ( g = 10 m/s 2 )

1. A. 1.8
2. B. 1.2
3. C. 1.5
4. D. 2.1

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