a)58.8 N
b)117.6 N
Step-by-step explanation
Weight is a quantity representing the force exerted on a particle or object by an acceleration field , on earth we have weigth due to acceleratioi of gravity ,its value is
caused by the presence of a massive second object,the earth
so, the weight is given as
Step 1
given
a) if she holds the box holding in both arms
the sum of force must equal zero, hence
so, the sum of the forces on both arms must equal tehh weigth of the box,
let's find the weigth of the box
so
therefore, she must exerts a force of 58.8 Newtons on each arm
a)58.8 N
Step 2
now, if she holds the box with only one arm:
in this case, the weight of the box must be supported by only one arm, so
the force must be equal to the weigth of the box
so
b)117.6 N
I hope this helps you