2002 · Q34
A and B ran over a distance starting from the same place. The distance-time graph is shown (not reproduced here). Consider the following statements:
- 1A ran throughout the given period of time with uniform velocity.
- 2A ran throughout the given period of time with uniform acceleration.
- 3B stopped running after 2 hours.
- 4A ran faster than B near the 2-hr stage.
Which of these statements is/are correct?
General SciencePhysics
- A2 and 3
- B1, 3 and 4
- C4 only
- D1, 2, 3 and 4
Explanation
A's distance–time graph is a straight line, which means A covered equal distances in equal times — uniform velocity (statement 1); constant (here zero) acceleration is itself uniform, so statement 2 also holds. B's graph becomes horizontal after 2 hours, meaning B covered no further distance — B had stopped (statement 3). Near the 2-hour mark A was still moving while B was stationary, so A was faster than B (statement 4). Note: the original paper included the distance–time graph. Hence all four statements are correct — (D).