Starting from rest, a 5.0 kg block slides 2.5 m down a rough 30.0 incline in 2.0 s. Determine the following
a. the work done by the force of gravity
b. the mechanical energy lost due to friction
c. the work done by the normal force between the block and the incline

3.2x10^7

  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.

snell's law

refractve index = sin incidence / sin refraction