NCERT Exercise 2.18 - Motion in a Straight Line
Question: Figure 2.15 gives a speed-time graph of a particle in motion along a constant direction. Three equal intervals of time are shown. In which interval is the average acceleration greatest in magnitude? In which is the average speed greatest? Give signs of v and a in the three intervals. What are the accelerations at points A, B, C and D?
Answer: Greatest |a?|: **III**; greatest average speed: **III**. v is positive in all intervals; a is positive, negative, positive in I, II, III. **a_A > 0; a_B = a_C = a_D = 0**.
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