A block of mass $M$ placed on rough surface of coefficient of friction equal to $3$ . If $F$ is the $(4/5)$ of the minimum force required to just move. Find out the force exerted by ground on the block
  • A$2.6\ Mg$
  • B$Mg$
  • C$4\ Mg$
  • D$3.4\ Mg$
Diffcult
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