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A ball is thrown upward at 15 m/s (v= +15 m/s). Neglecting air friction, it will return to the point from which it
was thrown with a downward speed of 15 m/s (v=-15 m/s). If the acceleration due to gravity is -10 m/s2, how
long will the ball remain in the air?
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Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.