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Physics: Magnitude of the electric field in a cell membrane. And electric potential at unknown location B between two points.

Please review the attached two problems, write how to solve every step so I can learn how to do these. Please only use algebra based formulas.

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The inner and outer surfaces of a cell membrane carry a negative and positive charge, respectively. Because of these charges, a potential difference of about 0.065 V exists across the membrane. The thickness of the membrane is 8.9 x 10-9 m. What is the magnitude of the electric field in the membrane?

The potential at location A is 626 V. A positively charged particle is released there from rest and arrives at location B with a speed vB. The potential at location C is 1060 V, and when released from rest from this spot, the particle arrives at B with twice the speed it previously had, or 2 vB. Find the potential at B.
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