If you double the amount of mass in a shopping cart by adding food to it, what do you have to do to the force to maintain the same acceleration as you had before?

Reduce the force

Explanation:

By newtons third law

F=m×a

or

Force =Mass ×Acceleration

In other words

Acceleration=Force/Mass

If the mass drops, to maintain the same acceleration, you need to reduce the force too

energy stored in the capacitor= 9.72 x 10⁻⁴ j

explanation:

the energy stored in the capacitor is given by

e= 1/2 c v²

e= energy stored

c= capacitance= 1.5 µc= 1.5 x 10⁻⁶f

v= potential difference=36 v

so energy stored= e= 1/2 (1.5 x 10⁻⁶) (36)²

energy stored= 9.72 x 10⁻⁴j