Let's break down each question based on the information given: --- ## **A1. a) What is the acceleration of the box?** From the free-body diagram: - Rightward force = 200 N (applied by the person) - Leftward force = 100 N (friction) - Upward force = 490 N (normal) - Downward force = 490 N (gravity) Only horizontal forces affect the acceleration to the right: - **Net force, \( F_{net} = 200\,N - 100\,N = 100\,N \)** Assuming the **mass** of the box \( m \) can be found from gravity: - \( F_{gravity} = mg = 490\,N \implies m = 490\,N / 9.8\,m/s^2 = 50\,kg \) Now, use Newton’s second law: \[ a = \frac{F_{net}}{m} = \frac{100\,N}{50\,kg} = 2\,m/s^2 \] **Correct answer: 4. 2 m/s²** --- ## **A1. b) What is the force the box exerts back on the person?** By Newton’s Third Law: For every action, there is an equal and opposite reaction. - The person pushes the box to the right with 200 N. - The box pushes back on the person to the left with **200 N**. **Correct answer: 3. 200 N** --- ### **Summary of Answers** - **A1(a)**: 2 m/s² - **A1(b)**: 200 N Let me know if you need the solution for A2 as well!