1.

A block of mass m = 2 kg is placed on a plank of mass \[M=10\text{ }kg\]which is placed on a smooth horizontal plane. The coefficient of friction between the block and the plank is\[\mu =\frac{1}{3}\]. If a horizontal force F is applied on the plank, then find the maximum value of F for which the block and the plank move together. (Take \[g=10\text{ }m/{{s}^{2}}\])

A. 30 N  
B. 40 N
C. 120 N             
D. None of the above
Answer» B. 40 N


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