In a four stroke engine, the piston compresses the gas mixture during the stroke.

Answer : Compression / Power

Explanation : In a four stroke engine, the piston compresses the gas mixture during the power / compression stroke.

In the second stage of compression stroke, the stroke begins at bottom dead center, or just at the end of the suction stroke, and ends at top dead center.

In this type of stroke, the piston usually compresses the air-fuel mixture in preparation for ignition during the power stroke.

  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.