A ball is thrown vertically upward with an initial speed of 15 m/s. (a) Find the maximum height reached. (2 marks) (b) Calculate the time taken to return to the starting point. (2 marks) (c) Sketch the velocity‑time graph for the whole motion. (2 marks)

Students typically interact with the question bank through school-issued accounts or by purchasing the physical and New 21st Century Chemistry series. For those looking for supplementary materials, the Jing Kung Book Center provides various editions of exercise books and mock exams.

: Questions are categorized by core syllabus areas, such as atomic structure, chemical bonding, stoichiometry, kinetics, chemical equilibrium, and organic chemistry.

A car accelerates uniformly from rest to 20 m/s in 5 seconds. What is its acceleration? A) 2 m/s² B) 4 m/s² C) 5 m/s² D) 10 m/s² Answer: B Sol: a = Δv/t = (20‑0)/5 = 4 m/s² Difficulty: ⭐, Cognitive: Apply