DP Physics (first assessment 2025)

Question EXE.1A.HL.TZ0.13

Date	Example questions Example questions	Marks available	[Maximum mark: 1]	Reference code	EXE.1A.HL.TZ0.13
Level	HL	Paper	1A	Time zone	TZ0
Command term		Question number	13	Adapted from	N/A

13.

[Maximum mark: 1]

EXE.1A.HL.TZ0.13

Two spaceships, X and Y move in opposite directions away from a space station. The speeds of the spaceships relative to the space station are $u$ and $v$ .

What is the speed of Y in the reference frame of X?

A. $\frac{u - v}{1 - \frac{u v}{c^{2}}}$

B. $\frac{u - v}{1 + \frac{u v}{c^{2}}}$

C. $\frac{u + v}{1 - \frac{u v}{c^{2}}}$

D. $\frac{u + v}{1 + \frac{u v}{c^{2}}}$

[1]

Markscheme

Syllabus sections

A. Space, time and motion

A. Space, time and motion » A.5 Galilean and special relativity

Question EXE.1A.HL.TZ0.13

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