A liner accelerator accelerated a germanium ion $(m=7\mathrm{.}2x10 -25)$ from rest $to$ a velocity $of\mathrm{ 7}\mathrm{.}3x106\frac{m}{s}$ over a time interval $of\mathrm{ 5}\mathrm{.}5x-6s.$ what was the magnitude $of$ the force that was required $to$ accelerate the ion?