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Assertion: A projectile that traverses a...

Assertion: A projectile that traverses a parabolic path show deviation from its idealised trajectory in the presence of air resistance.
Reason: Air resistance affect the motion of the projectile.

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In the presence of dissipative forces like air friction which opposes the motion, any object will lose some part of its initial energy and consequently momentum too. Thus a projectile that traverses a parabolic path would certainly show deviation from its idealised trajectory in the presence of air resistance.
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