📚 Year 7 Cambridge Physics: Case Study Practice | 剑桥七年级物理：案例分析实战演练
Physics comes alive when you link theory to real-world situations. Working through case studies sharpens your analytical thinking and prepares you for exam-style questions. The following eight case studies cover key topics from the Year 7 Cambridge Physics syllabus: motion, forces, energy, electricity, waves, and magnetism. Read each scenario carefully, apply your physics knowledge, and check the step-by-step solutions.
当你将理论与现实情境联系起来时，物理就变得生动起来。通过案例研究可以锻炼分析思维，并为应对考试题型做好准备。以下八个案例分析涵盖了剑桥七年级物理课程中的重点主题：运动、力、能量、电、波以及磁。请仔细阅读每个情景，运用物理知识，并核对分步解答。
1. The Speedy Cyclist | 飞驰的自行车手
A cyclist completes a 15 km ride in 30 minutes. You need to determine his average speed in kilometres per hour and predict how far he can travel in 2 hours at the same speed.
一名自行车手在30分钟内完成了15公里的骑行。你需要求出他以公里/小时为单位的平均速度，并预测以同样的速度在2小时内他能行驶多远。
Question: (a) Calculate the average speed. (b) How far will the cyclist
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