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Per NCERT, in motion problems we treat objects as POINT OBJECTS. When is this approximation valid?
AWhen the size of the object is much SMALLER than the distance it moves in a reasonable duration of time
BAlways — regardless of size
COnly for stationary objects
DOnly for fast objects
Answer & Solution
Correct answer: A. When the size of the object is much SMALLER than the distance it moves in a reasonable duration of time
Per NCERT §2.1, point-object approximation is valid when size ≪ distance covered.
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