Initial Acceleration from Lorentz Force

A charged particle with a charge-to-mass ratio of $\frac{q}{m} = 2.0 \times 10^8$ C/kg enters a region with a uniform electric field $\vec{E} = 3.0 \times 10^4\, \hat{\jmath}$ N/C and a uniform magnetic field $\vec{B} = 0.40\, \hat{\imath}$ T. At the moment the particle enters the region, its velocity is $\vec{v} = 2.0 \times 10^5\, \hat{k}$ m/s. What is the initial acceleration of the particle?