Oxygen gas is used to fill a balloon and a short time later the balloon is observed to only be half full. explain this observation.

The The balloon leaks and the temperature went down.

If the oxygen leaks from the balloon, it is going to become smaller. Also, when gases are heated, they expand and when they are cooled, they contract. This is called thermal expansion.

  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.