Comprehension type questions In the figure is a graph of velocity $\rightarrow$ time for a particle.
How will you calculate the acceleration of the particle?
(A) taking length of $\mathrm{AB}$
(B) taking magnitude of $\mathrm{BC}$
(C) taking slope of $\mathrm{AC}$
(D) taking slope of $\mathrm{AB}$