Suppose a mechanical wave is traveling through medium A. When the wave enters medium B, it speeds up. Which of the following statements is true about medium A and medium B? The answers:
A. Medium A is a solid and medium B is a gas.
B. Medium A is a liquid and medium B is a solid.
C. Medium A is a gas and medium B is a vacuum.
D. Medium A is a vacuum and medium B is a liquid.

  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.

because if the tool that you are using is not balanced it there would be false mass.