character: Galileo Galilei
topic: Early concepts of projectile motion
grade: 9
subject: Physics
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character: Isaac Newton
topic: Laws of motion and their relation to projectile motion
grade: 9
subject: Physics
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character: Aristotle
topic: Early theories on motion and gravity
grade: 9
subject: Physics
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character: Leonardo da Vinci
topic: Studies on falling bodies and initial motion concepts
grade: 9
subject: Physics
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