Four particles are held in place at the corners of a square with sides of length L. Each particle has a charge q and mass m. (a) What is the

Four particles are held in place at the corners of a square with sides of length L. Each particle hasa charge q and mass m. (a) What is the potential energy of this system of charges? (b) Startingfrom the rest, the particles are now released. How fast is each particle moving when their distancefrom the centre of the square doubles? Give your answers as algebraic expressions.