1. In figure, two identical particles each of mass m are tied together with an inextensible string.  This is pulled at its centre with a constant force F. If the whole system lies on a smooth  horizontal plane, then the acceleration of each particle towards each other is :

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30 3 F 1 F F (a) (b) (c) 2 m 23 m (d) 3 m 2. Two blocks A and B are separated by some distance and tied by a string as shown in the figure. The force of friction on both the blocks at t = 2s is: m-1kg 2kg P=21 F-15N 3. (a) 4N(), 5N() (b) 2N(),5N( 30 3 F 1 F F (a) (b) (c) 2 m 23 m (d) 3 m 2. Two blocks A and B are separated by some distance and tied by a string as shown in the figure. The force of friction on both the blocks at t = 2s is: m-1kg 2kg P=21 F-15N 3. (a) 4N(), 5N() (b) 2N(),5N(