IB Physics HL A.5.14 World lines and speed Question Bank
Practise IB Physics HL A.5.14 by applying world lines and speed concepts to exam-style physics questions.
- Syllabus
- First assessment 2025
- Course
- Physics HL
- Level
- HL
Practise IB Physics HL A.5.14 by applying world lines and speed concepts to exam-style physics questions.
The space-time diagram shows the coordinate axes (x, c t) of an inertial reference frame S. Two events, P and Q, are plotted.

Events P and Q occur simultaneously in an inertial reference frame S′. The clocks of S and S′ are synchronized at x=x′=0.
Determine the speed of S′ relative to S.
\\\frac{v}{c}=\\frac{1}{3}\, so \v=0.33c\ or \1.0 \\times 10^{8}\\ \\mathrm{m}\,\\mathrm{s}^{-1}\.\n\nWatch for ECF from b(i).\n\nAllow fraction as the answer, i.e. \\\frac{c}{3}\.