The electric field inside a battery generates an electric potential difference of 12 v. the plates are separated by a distance of 0.25 m. what is the strength of the electric field?

What is the most useful equation for electric power?

Water flows through a garden hose which is attached to a nozzle. the water flows through hose with a speed of 2.19 m/s and through the nozzle with a speed of 19.8 m/s. calculate the maximum height (in m) to which water could be squirted if it emerges from the nozzle and emerges with the nozzle removed.

Can any one me on number 4? i do know that it’s not a cause i gotten that wrong on the first try.