A child is on a spinning merry-go-round and the child walks to center of it. Is angular momentum preserved if only the child is the system? Is angular momentum preserved if the system is the child and the merry-go-round?

  distance on the y-axis and time on the x-axis.

explanation:

the instantaneous velocity = change in position/time taken

the slope of the graph should give instantaneous velocity.

  slope of a graph = change in value of y -axis / change in values of x -axis

  comparing both the equations

    change in value of y -axis = change in position

  change in values of x -axis = time taken

so position values should be on the y axis and time values should be on the x axis.

distance on the y-axis and time on the x-axis.

e/c, where e is its total energy