Graph of the velocity of the box as a function of time, with times t1, t2 and t3 marked

A box moving on a horizontal surface experiences a varying force that changes its velocity. The graph shows the velocity of the box as a function of time. Which of the following correctly describes the change in net power \(\Delta P_{\text{net}}/\Delta t\) for the given intervals of time?

	Between \(0\) and \(t_1\)	Between \(t_1\) and \(t_2\)	Between \(t_2\) and \(t_3\)
A	\(\Delta P_{\text{net}}/\Delta t > 0\)	\(\Delta P_{\text{net}}/\Delta t = 0\)	\(\Delta P_{\text{net}}/\Delta t > 0\)
B	\(\Delta P_{\text{net}}/\Delta t = 0\)	\(\Delta P_{\text{net}}/\Delta t = 0\)	\(\Delta P_{\text{net}}/\Delta t < 0\)
C	\(\Delta P_{\text{net}}/\Delta t = 0\)	\(\Delta P_{\text{net}}/\Delta t > 0\)	\(\Delta P_{\text{net}}/\Delta t < 0\)
D	\(\Delta P_{\text{net}}/\Delta t > 0\)	\(\Delta P_{\text{net}}/\Delta t = 0\)	\(\Delta P_{\text{net}}/\Delta t < 0\)