2 Points
What is the electric force acting between two charges of -0.0085 C and
-0.0025 C that are 0.0020 m apart?
k9,92
Use F
and k = 9.00 x 10°N-m/c2.

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.