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True free fall, in which all objects reach the ground at the same time regardless of mass, is possible only:
AOn a windy day
BIn vacuum
CInside dense fog
DAt high altitude in air
Answer & Solution
Correct answer: B. In vacuum
1. In air, a falling object experiences a frictional (air-resistance) force and a buoyant force opposing motion.
2. These extra forces make a feather fall slower than a stone in air.
3. Removing the air removes both forces, so only gravity acts.
4. Hence true free fall, where objects fall identically, is possible only in vacuum.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 1 "Gravitation", p.20_
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