The main difference between the internal combustion engine and the diesel engine is that the diesel engine
a. does not utilize pistons.
b. has no connecting rods.
c. has no ignition system.
d. does not have a crankshaft.

The main difference is that the diesel engine has no ignition system.

  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.