Question

Each of the three graphs represents acceleration versus time for an object that already has a positive velocity at time $t_1$. Which graphs show an object whose speed is increasing for the entire time interval between $t_1$ and $t_2$?

• A. graph $I$, only
• B. graphs $I,II$ and $III$
• C. graphs $I$ and $III$, only
• D. graphs $I$ and $II$, only

Answer 1

The correct option is B graphs $I,II$ and $III$

As we know, acceleration is the change in velocity with time.
Acceleration is positive in all three given graphs, hence, velocity increases in all three graphs.

Final answer: (d)