Answer:
it's like the answer is average speed
The answer is "friction and air resistance" gravity does some of the work by keeping the object from floating away, but friction and air resistance does the biggest part. Friction is how rough the ground it meaning on tile, dirt, grass, etc... that would slow down the object and air resistance is the gravity pushing on the object also making it stop.
Hope this helps!
Answer:

Explanation:
for the calculation of the electric potential inside a parallel plate capacitor you can use the formula for the electric field inside the capacitor.

where d is the distance between plates and E is the electric field, which is given by:

By replacing you obtain:

where Q is the charge stored by the capacitor and A is the area of the plates.
hence, the answer is Qd/Ae0
Stored energy=energy that is stored and may not be used, conservation of energy= saved energy that you can use for other things.