Two small identical conducting balls start with different am

Two small identical conducting balls start with different amounts of charge on them. Initially, when they are separated by 70.0 cm (this is the center-to-center distance), one ball exerts an attractive force of 2.50 N on the second ball. The balls are then touched together briefly (charge is conserved in this process), and then again separated by 70.0 cm. Now both balls have a positive charge, and the force that one ball exerts on the other is a repulsive force of 1.20 N. For this problem, use k = 9.0 [img src=’http://www.webassign.net/images/multiply.gif’> 109 N m2 / C2,70.0 cm.(a) After the two balls have been touched together, what is the charge on each ball?(b) Before they were touched together, one ball had a positive charge. How much charge did that ball (c) Before they were touched together, one ball had a negative charge. How much charge did that ball have? (Don’t forget to include the minus sign!)