i$)$ A lamp hangs vertically from a cord in a descending elevator that decelerates at $1\mathrm{.}6$ m$/$s$2.$ Calculate the lamp$$s mass if the tension in the cord is $60$ N$.$ Calculate the cord's tension when the elevator ascends with an upward acceleration of $2\mathrm{.}4$ m$/$s$2.(10$ marks$)$