Where f is force, m is mass, v is velocity, and t is duration of impact, what other information do you need in order to determine the force of the car at the impact

newton's second law helps here.

mass times star velocuty minus mass times end velocity divided by time = force.

short time ,,, hig force

long time lower force ... padding reduces shock ... impulse

i think it's 35 meters

  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.