IB Physics HL A 5 4 Hl Galilean Velocity Addition Questions

Use Galilean velocity addition with signed velocities to calculate relative motion, meeting times and the classical speed of light.

Exam points

Apply u′=u−v with a consistent sign convention to find a velocity in a moving Galilean frame.
Use signed velocity addition to calculate relative or closing speed and the time for moving objects to meet.
Use the Galilean model to predict the speed of light in another frame and identify why this classical prediction fails experimentally.

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Study A.5.4 (HL)—Galilean velocity addition conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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Two rockets, A and B , are moving towards each other on the same path. From the frame of reference of the Earth, an observer measures the speed of A to be 0.6 c and the speed of B to be 0.4 c. According to the observer on Earth, the distance between A and B is $6.0 \times 10^{8} \mathrm{~m}$ .

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Calculate, according to the observer on Earth, the time taken for A and B to meet.

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IB Physics HL A 5 4 Hl Galilean Velocity Addition Questions question 1