Five forces $\overrightarrow{F_1}$, $\overrightarrow{F_2}$, $\overrightarrow{F_3}$, $\overrightarrow{F_4}$ and $\overrightarrow{F_5}$ are acting on a particle of mass 2.0 kg so that it is moving with 4 $m/s^2$ in east direction. If $\overrightarrow{F_1}$ force is removed, then the acceleration becomes 7 $m/s^2$ in north, then the acceleration of the block if only $\overrightarrow{F_1}$ is acting will be: