NCERT Example 2.1 - Motion in a Straight Line
Question: The position of an object moving along the x-axis is given by x = a + bt², where a = 8.5 m, b = 2.5 m s⁻², and t is measured in seconds. What is its velocity at t = 0 s and t = 2.0 s? What is the average velocity between t = 2.0 s and t = 4.0 s?
Answer: At t = 0: **0 m s⁻¹**; at t = 2 s: **10 m s⁻¹**; average velocity (2–4 s): **15 m s⁻¹**.
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