The measurement of an electron's energy requires a time interval of 1.2×10^−8 s . what is the smallest possible uncertainty in the electron's energy?

Explanation:

The uncertainty in energy is given by

here h is plank's constant which value is and is the time interval which is given as

So using all the parameters the smallest possible uncertainty in electrons energy is

the diagram which shows forces as either balanced = same speed or unbalanced = accelerarting

mass and volume are the answers you are looking for