In your physics lab, a block of mass $m$ is at rest on a horizontal surface. You attach a light cord to the block and apply a horizontal force to the free end of the cord. You find that the block remains at rest until the tension $T$ in the cord exceeds 20.0 N. For $T >$ 20.0 N, you measure the acceleration of the block when $T$ is maintained at a constant value, and you plot the results $\textbf{(Fig. P5.109).}$ The equation for the straight line that best fits your data is $a = [0.182 m/(N \cdot s^2$)]$T - 2.842 m/s^2$. For this block and surface, what are (a) the coefficient of static friction and (b) the coefficient of kinetic friction? (c) If the experiment were done on the earth's moon, where $g$ is much smaller than on the earth, would the graph of $a$ versus $T$ still be fit well by a straight line? If so, how would the slope and intercept of the line differ from the values in Fig. P5.109? Or, would each of them be the same?