PLEASE HELP ASAP a force of -7.7 x 10^3N exists between a positive charge of 5.6 x 10-^4C and a negative charge of -2.1 x 10^-4C. What distance separates the charges? ​

With i really need the correct answer!

An electron is traveling with initial kinetic energy k in a uniform electric field. the electron comes to rest momentarily after traveling a distance d. (a) what is the magnitude of the electric field

The experiment done in lab is repeated, using a ball that has unknown mass m. you plot your data in the form of f 2 versus m/l, with f in rev/s, m in kg, and l in m. your data falls close to a straight line that has slope 3.19 m/(kg · s2). use g = 9.80 m/s2 and calculate the mass m of the ball.