The student has provided a focused and detailed topic of investigation by clearly stating the research question: "What is the relationship between the internal air pressure and the coefficient of restitution of different sports balls?" The physics concepts related to the topic, such as the coefficient of restitution and the law of conservation of energy, are explained well enough for the reader to understand without any confusion. The methodology of the investigation is clear and easy to follow, with sections covering variables, apparatus, setup diagram, and method. The student also includes steps to assure the relevance and reliability of the collected data by discussing the variables that need to be controlled or maintained constant. However, the research question could be improved by including the values and units of the independent variable and specifying the types of balls used in the experiment. Additionally, the student should address safety, ethical, and environmental issues in the risk assessment section.
