A body of mass 2 kg slides down with an acceleration of $3 \mathrm {~m} / \mathrm { s } ^ { 2 }$ on a rough inclined plane having a slope of $30 ^ { \circ }$ . The external force required to take the same body up the plane with the same acceleration will be: $\left( \mathrm { g } = 10 \mathrm {~m} / \mathrm { s } ^ { 2 } \right)$\\
(1) 4 N\\
(2) 14 N\\
(3) 6 N\\
(4) 20 N