Question

Motion of y axis is along?

Answer 1

Answer:

We just calculate the motion along the x and y axis separately to make the calculation easier. Since acceleration due to gravity only acts along the y axis, when we seperate the calculation for x and y axis then in the x axis calculation we just say 'it's moving at constant velocity' whereas in y axis we just say 'it's accelerating downwards'.

Also, we can calculate stuff like variation of distance and height with time.

With more advanced math you can do cool stuff like 'rotating' and 'moving' the x and y axes.