Quick questions on Projectile motion with resistance in HSC Mathematics Extension 2: resolving motion into components and modelling air resistance proportional to velocity in two dimensions

Q: What is sign of gravity and resistance?

With up positive, gravity contributes -mg and resistance opposes velocity in each direction. A misplaced sign reverses the physics.

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What is sign of gravity and resistance?

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With up positive, gravity contributes

-mg

and resistance opposes velocity in each direction. A misplaced sign reverses the physics.

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