Answer:
mass =25 kg
using clockwise moment = anticlockwise moment
The work-energy theorem states that the change in kinetic energy of the particle is equal to the work done on the particle:

The work done on the particle is the integral of the force on dx:

So, this corresponds to the change in kinetic energy of the particle.
We did this experiment before, when the rope moves, it represents the waves passing through in from the level of intensity. I hope this is a good answer.
Compared to the charge on a proton, the amount of charge on an electron is same and has the opposite sign