Electrostatics

A \(2 \mathrm{~g}\) object, located in a region of uniform electric field \(\mathrm{E}=\left(300 \mathrm{NC}^{-1}\right) \hat{\mathbf{i}}\) carries a charge \(Q\). The object released from rest at \(x=0\), has a kinetic energy of \(0.12 \mathrm{~J}\) at \(x=0.5 \mathrm{~m}\). Then, \(Q\) is