Acceleration graph for projectile with parachute

Steps:

• Identify the graph's features: likely shows initial positive acceleration (upward thrust), then deceleration to zero at peak, negative acceleration during fall, and sudden decrease upon parachute deployment.
• Match to scenarios: acceleration involves rate of velocity change, fitting powered ascent and drag effects.
• Eliminate non-matching: options without thrust or parachute won't show distinct phases.
• Confirm B: firework has rocket boost, gravity, and parachute drag, producing a multi-phase acceleration curve.

Why B is correct:

• Fireworks experience upward acceleration from thrust (Newton's second law, F=ma with net upward force), zero at apex, downward g until parachute increases drag force, sharply reducing acceleration magnitude.

Why the others are wrong:

• A: Skydivers lack initial thrust; acceleration starts negative from jump, no positive phase.
• C: Javelin speed decreases monotonically under gravity; acceleration is constant -g, no variations or parachute.
• D: High jumper has constant -g acceleration throughout; no thrust or drag changes.

Final answer: B