Posted by **Jessica** on Thursday, December 16, 2010 at 8:24pm.

A vertical spring with constant 830 N/m has a ball of mass 3 kg attached to the bottom of it, which is held with the spring unstretched.

(a) How far must the ball be lowered to reach its equilibrium position?

(b) The ball is given a charge of 0.060 C. If an electric field directed upward is applied, increasing slowly to a maximum value of 270.0 N/C, how far below the unstretched position is the new equilibrium position of the ball?

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