DP Physics (last assessment 2024)

Question 22N.1.SL.TZ0.3

Date	November 2022	Marks available	[Maximum mark: 1]	Reference code	22N.1.SL.TZ0.3
Level	SL	Paper	1	Time zone	TZ0
Command term		Question number	3	Adapted from	N/A

[Maximum mark: 1]

22N.1.SL.TZ0.3

Ball 1 is dropped from rest from an initial height $h$ . At the same instant, ball 2 is launched vertically upwards at an initial velocity $u$ .

At what time are both balls at the same distance above the ground?

A. $\frac{h}{4 u}$

B. $\frac{h}{2 u}$

C. $\frac{h}{u}$

D. $\frac{2 h}{u}$

[1]

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Examiners report

This question turned out to be challenging especially to SL candidates, and the number of blank answers was higher than expected. The most efficient way of solving it is by equating algebraic expressions for the height of each ball as a function of time, e.g. $h - \frac{1}{2} g t^{2} = u t - \frac{1}{2} g t^{2}$ , followed by cancellation of the quadratic term.

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Core

Core » Topic 2: Mechanics » 2.1 – Motion

Core » Topic 2: Mechanics

Question 22N.1.SL.TZ0.3

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