I am standing (yes, the question actually goes like this!) on a level floor at the origin of an inertial frame S and kick a frictionless puck due north across the floor. a.) Write down the x and y coordinates of the puck as functions of time as seen from my inertial frame. (use x and y axes pointing east and north respectively). now consider two more observers, the first at rest in a frame S' that travels with constant velocity v due east releative to S, the second at rest in a frame S'' that travels with constant acceleration due east relative to S. (all three frames coincide at the moment i kick the puck and S'' is at rest relative to S at that same moment. b.) find the coordinates x',y' of the puck and describe the puck's path as seen from S'. C.) do the same for S''. Which of the frames is inertial? Ok, well I know the puck is obviously not travelling east at all, so the x coordinate will stay at 0 from 'my reference frame'. I'm not sure where to start for a formula for the y-coordinate from his reference frame for a.) For b.) Since S' is not accelerating, the puck will appear to just move west. c.) S'' which is not inertial, will make S appear to move south west? How do i start finding the coordinates? thanks!