In the shown arrangement mass of $A = 1\,\,kg$  mass of  $B = 2\,\,kg.$  Coefficient of friction between $A $ and $B = 0.2.$  There is no friction between $B$  and ground. The frictional force exerted by $A$ on $B$ equals to
  • A$\frac {5}{3}\,\,N$
  • B$\frac {7}{8}\,\,N$
  • C$5\,\,N$
  • D
    None
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