a) Parcel’s centre of mass at instantaneous time
b) Parcel’s centre of pressure at instantaneous time
c) Parcel’s centre of mass at initial time
d) Parcel’s centre of pressure at initial time
Answer: c
Explanation: Parcel’s centre of pressure is not suitable as it depends not only on position but on many variables too. Instantaneous time continuously varies along with the path. So, it cannot be a tag.
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