A force parallel to the xx-axis acts on a particle moving along the xx-axis. This force is associated with potential energy U(x)U(x) given by U(x)=αx4U(x)=αx4 , where ααalpha = 0.770 J/m4J/m4 . Part A What is the direction of the force when the particle is at x = -0.800 mm?

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grav potential energy

  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.