DP Physics (first assessment 2025)

Question EXE.2.HL.TZ0.4c

Date	Example questions Example questions	Marks available	[Maximum mark: 3]	Reference code	EXE.2.HL.TZ0.4c
Level	HL	Paper	2	Time zone	TZ0
Command term	Determine	Question number	c	Adapted from	N/A

[Maximum mark: 3]

EXE.2.HL.TZ0.4c

(c)

Determine v_A. State the answer in terms of v.

[3]

Markscheme

Energy is conserved hence $\frac{1}{2} m {v_{A}}^{2} + \frac{1}{2} m {v_{B}}^{2} = \frac{1}{2} m v^{2}$ ✓

Eliminate $v_{B}$ using the result of part (a), e.g., ${v_{A}}^{2} + {(\frac{\sin 70 °}{\sin 20 °})}^{2} {v_{A}}^{2} = v^{2}$ ✓

$v_{A} = 0.342 v$ ✓

Syllabus sections