Statement1: In absence of air, projectile motion is always a 2D motion.
Statement2: In absence of any external force in 3D space, at any time during its flight Projectile's velocity has only two components.

Statement 1 is correct but statement 2 is incorrect

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Statement 1 is incorrect but statement 2 is correct

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Both statements are correct and statement 2 is the correct explanation for statement 1.

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Both statements are correct and statement 2 is NOT the correct explanation for statement 1.

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Solution

The correct option is B
Statement 1 is incorrect but statement 2 is correct

The projectile has velocity in one direction and acceleration in other so it's motion can be only in 2D. Initially velocity has two components in some X-Z plane (suppose). So without any external force in Y direction, it cannot gain any component of velocity. And to be 1D both velocity and acceleration have to be in same direction.

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Similar questions

Statement1: In absence of air, projectile motion is always a 2D motion.
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Statement1: In absence of air, projectile motion is always a 2D motion. Statement2: In absence of any external force in 3D space, at any time during its flight Projectile's velocity has only two components.

Statement1: In absence of air, projectile motion is always a 2D motion.
Statement2: In absence of any external force in 3D space, at any time during its flight Projectile's velocity has only two components.