Atrain travels 98 kilometers in 4 hours, and then 61 kilometers in 3 hours. what is its average speed?

Two large, flat, horizontally oriented plates are parallel to each other, a distance d apart. half way betwween the two plates the electric field has magnitude e. if the separation of the plates is reduced to d/2 what is the magnitude of the electric field half way between the plates?

If y gets smaller as x gets bigger and y have an relationship?

Positrons are spontaneously emitted from the nuclei of