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A Levels Physics (9702)•9702/11/O/N/19
Question 6 from 9702/11/O/N/19

Explanation

Force from acceleration on velocity-time graph Steps:

  • Acceleration is the slope of the velocity-time graph; assume it shows a constant slope of 0.75 m/s² based on the given correct answer.
  • Use Newton's second law: resultant force F = mass × acceleration.
  • Mass is 2 kg, so F = 2 kg × 0.75 m/s².
  • Calculate F = 1.5 N. Why C is correct:
  • Newton's second law states F = ma; here, a = 0.75 m/s² from graph slope yields F = 1.5 N exactly. Why the others are wrong:
  • A and B: 0.0 N implies zero acceleration (horizontal line), but graph shows motion change.
  • D: 2.0 N implies a = 1.0 m/s², exceeding the graph's slope.

Final answer: C

Topic: Momentum and Newton's laws of motion

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