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Date	May 2022	Marks available	1	Reference code	22M.1.SL.TZ1.9
Level	Standard level	Paper	Paper 1	Time zone	1
Command term		Question number	9	Adapted from	N/A

Question

Two trolleys of equal mass travel in opposite directions as shown.

The trolleys collide head-on and stick together.

What is their velocity after the collision?

A. 1 m s⁻¹

B. 2 m s⁻¹

C. 5 m s⁻¹

D. 10 m s⁻¹

Markscheme

Examiners report

The majority of SL candidates selected option B, finding the difference in velocity but neglecting to recognize that mass will have doubled. This question had a relatively high discrimination index suggesting more able candidates had greater success demonstrating this recognition.

Syllabus sections

Core » Topic 2: Mechanics » 2.4 – Momentum and impulse

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