A 1.2-kg mass is oscillating without friction on a spring whose spring constant is 3400 N/m. When the mass displacement is 7.2 cm, what is the acceleration?

Imagine you had to physically add electrons, one at a time, to a previously neutral conductor. you add one electron very easily, but the second electron requires more work. in your initial post to the discussion, explain why this is. also, what happens to the work needed to add the third, fourth, fifth, and subsequent electrons