5. A spring of spring constant 55 Nm is used to launch a wooden block up a rough slope. The block reaches a distance, d, along the slope before sliding back down.

The block has mass 60.g. The spring is initially compressed by 5.0 cm. The coefficient of dynamic friction ud between the block and the slope is 0.61. Calculate the distance d.
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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.