Because the elevator is going downwards we will use the next formula
[tex]W-T=ma[/tex]Where W is the weight, T is the tension, m is the mass and a the acceleration.
We can calculate the weight using the next formula
[tex]W=mg[/tex]where g is the gravity.
We substitute the formula on the first formula and we get
[tex]mg-T=ma[/tex]We isolate T
[tex]T=mg-ma=m(g-a)[/tex]We have the next data
m=60 kg
g=9.8 m/s^2
a=2.5m/s^2
We substitute
[tex]T=60(9.8-5)=288N[/tex]Then we divide between the gravity
[tex]\frac{288}{9.8}=29.4kg[/tex]