Find the kinetic energy, gravitational potential energy, and total mechanical energy at each of the five points listed below using the information provided. A 20-kg ball is dropped down a ramp at position A at a height of 400m. Assume that each position on the ramp is equidistant from the other and that there is no friction. Show your work please!

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.