A body of weight $64 \mathrm{N}$ is pushed with just enough force to start it moving across a horizontal floor and the same force continues to act afterwards. If the coefficients of static and dynamic friction are $0.6$ and $0.4$ respectively, the acceleration of the body will be (Acceleration due to gravity = $g=10 \mathrm{m} {\mathrm{s}}^{-2}$)

Hence, the correct answer is 2.