Final answer:
The final speed of an electron released from rest at the negative plate can be calculated using the formula v = sqrt((2V) / m), where V is the voltage and m is the mass of the electron.
Step-by-step explanation:
To find the final speed of an electron released from rest at the negative plate, we can use the concept of voltage and kinetic energy. When an electron is accelerated through a voltage, it gains kinetic energy. The formula to calculate the final speed is:
V = (1/2)mv^2
Where V is the voltage, m is the mass of the electron, and v is the final speed. Rearranging the formula to solve for v, we get:
v = sqrt((2V) / m)
Substituting the given values (V = 25.0 MV = 25,000,000 V and m = mass of an electron), we can calculate the final speed.