Which of the following is true about the position versus time graph of an object that comes to a stop, then remains at rest?
a. there is no change in slope.
c. the slope changes from positive to negative.
b. the slope changes to zero.
d. none of the above.

b. the slope changes to zero.  [ As no increase on y-axis observe ]

Hope this helps!

Answerthe energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.explanationwe define electric potential as the ratio electric potential energy to the charge,    then the following gives us the potential difference,      the formula  may be on your formula sheet.the change in electric potential energy would be the energy that would needed to move it from point a to point b. solving for that, we get    using q = 8.00  × 10⁻¹⁹ c and  δv = 2.00 v, we get    the energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.