A) what is the kinetic energy of a 1500 kg car traveling at a speed of 30 m/s (65mph)? b) from what height should the car be dropped to have this same amount of kinetic energy just before impact? c) does your answer to part b depend on the car's mass?

a) 675000J

b) 45m

c) No

Explanation:

a) The car kinetic energy with such mass and speed is:

b) For the car to have the same kinetic energy just before the impact, its potential energy before dropped must be as much as the kinetic energy

c) According to the conservation in energy

Since masses cancel out, the height does not depend on its mass.

-4 on

  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.