In the given figure the blocks A, B and C weigh 4 kg, 6 kg and 8 kg respectively. The co-efficient of sliding friction between any two surfaces is…

In the given figure the blocks $\displaystyle A, B$ and $\displaystyle C$ weigh $\displaystyle 4 \mathrm{~kg}, 6 \mathrm{~kg}$ and $\displaystyle 8$ kg respectively. The co-efficient of sliding friction between any two surfaces is $\displaystyle 0.5$ . The force $\displaystyle \vec{F}$ required to slide the block $\displaystyle C$ with constant speed is $\displaystyle \_\_\_\_$ N . (Use $\displaystyle g=10 \mathrm{~m} / \mathrm{s}^2$ )