# 3.  Two blocks A and B each of mass $\frac{1}{2}kg$ is connected by a massless inextensible string and kept on horizontal surface.  Coefficient of friction between block and surface is shown in figure.  A force F = kt (Where k = 1 N/s and t is time in secon D)  applied on A.  Then (g = 10 m/s2 ) A)  work done by friction force on block B is zero in time interval t = 0 to t = 3s. B)  work done by friction force on block A is zero in time interval t = 0 to t = 3s. C)  work done by tension on B is also zero in time interval t = 0 to t = 3s. D)  speed of blocks at t = 10s is 27.5 m/s.

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