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Q. The potential at location A is 426 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 788 V, and when released from rest from this spot, the particle arrives at B with twice the speed it previously had, or 2vB. Find the potential at B.

Q. Megan's mass is 28 kg. She climbs the 4.8 m ladder of a slide and reaches a velocity of 3.2 m/s at the bottom of the slide. How much work was done by friction on Megan? Assume that air resistance is negligible.

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