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For an object thrown vertically upward, the acceleration due to gravity is taken as $-g$ because:
AIt acts opposite to the direction of the velocity
BIts magnitude becomes smaller while going up
CGravity stops acting once the object rises
DThe object gains energy as it moves higher
Answer & Solution
Correct answer: A. It acts opposite to the direction of the velocity
1. While going up the object's velocity is directed upward.
2. The Earth's gravity still pulls it downward, opposite to this velocity.
3. Taking up as positive, the acceleration is therefore negative, written $-g$.
4. Its magnitude $g$ is unchanged; gravity does not stop, so those options are wrong.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 1 "Gravitation", p.20_
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