When you lift a certain box using $55$ N$,$ it accelerates at a rate of a m$/$s$2.$ When you use $70$ N to lift the same box, it accelerates at a rate of $2$a m$/$s$2.$ What is the mass of the box?Select answer from the options below$75$ kg$4\mathrm{.}1$ kg$1\mathrm{.}5$ kg$8\mathrm{.}7$ kg