Which of the following graphs has a slope that indicates positive acceleration?

The last graph

Explanation:

Acceleration is defined as the rate of change in velocity per unit time:

where is the change in velocity while is the change in time.

In a velocity-time graph, the acceleration also corresponds to the slope of the curve. Among all the graphs shown here, only the second one and the 4th one shows a velocity-time graph. Among these two, only the 4th graph shows a curve with positive slope: this means that the velocity is increasing, so the acceleration of the object is positive.

it is the second option.

the force on the thing and the distance the force moves the thing