An angry child throws a toy straight up at the ceiling with an initial velocity of 5.2 m/s. It travels up, stops before hitting the ceiling, and hits the ground below the height at which it was thrown. What was the original height of the toy (when it was thrown) if it
takes 1.2 seconds to hit the ground?

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.