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A tiny sphere of mass 7.30 mg and charge −2.80 nC is initially at a distance...

A tiny sphere of mass 7.30 mg and charge −2.80 nC is initially at a distance of 1.74 μm from a fixed charge of +9.01 nC.

(a) If the 7.30-mg sphere is released from rest, find its kinetic energy when it is 0.500 μm from the fixed charge.
J

(b) If the 7.30-mg sphere is released from rest, find its speed when it is 0.500 μm from the fixed charge.
m/s

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