A video is a collection of motion pictures measured in frames/second. Ordinary cameras can attain 60 frames/second. Cameras are used to capture and analyze movements occurring very fast, typically to the order of milliseconds. The nearly vertical launch of a 450 g and 42.0 cm long projectile is shown in the graph below. Use the graph to determine the acceleration of the projectile at 10 ms, 25 ms, and 40 ms. Hint: Approximate the curve to a straight line.

• A. a₁₀ = 100 m/s²; a₂₅ = 200 m/s²; a₄₀ = 175 m/s²
• B. a₁₀ = 1.0 m/s²; a₂₅ = 5.0 m/s²; a₄₀ = 7.0 m/s²
• C. a₁₀ = 0 m/s²; a₂₅ = 0 m/s²; a₄₀= 0 m/s²
• D. a₁₀ = 280 m/s²; a₂₅ = 280 m/s²; a₄₀ = 0 m/s²

Answer: (D)