IGCSE CIE Science: Worked Examples Explained | IGCSE CIE 科学：典型例题详解

📚 IGCSE CIE Science: Worked Examples Explained | IGCSE CIE 科学：典型例题详解

Typical worked examples are an essential part of revision for IGCSE CIE Coordinated Sciences or Combined Science. This article covers representative problems from Physics, Chemistry, and Biology, providing step-by-step solutions and key conceptual explanations. Mastering these examples will help you tackle similar questions confidently in your examination.

典型例题是IGCSE CIE协调科学或综合科学复习的重要组成部分。本文涵盖物理、化学和生物中的代表性题目，提供逐步解答和关键概念解释。掌握这些例题将帮助你在考试中自信应对类似问题。

1. Physics – Interpreting Distance-Time Graphs | 物理 – 解读距离-时间图

Problem: A student walks from home to school. The distance-time graph shows: from 0 to 300 s, distance increases from 0 to 400 m; then from 300 to 420 s, distance remains constant at 400 m; finally, from 420 to 600 s, distance increases further to 600 m. Calculate (a) the speed during the first 300 s, (b) the average speed for the whole journey.

题目： 一位学生从家步行去学校。距离-时间图显示：从0到300秒，距离从0增加到400米；随后300到420秒，距离保持在400米；最后420到600秒，距离增加到600米。计算 (a) 前300秒内的速度；(b) 整个行程的平均速度。

Step 1: Identify the three sections. Section A (0–300 s): moving away from start, distance 0→

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