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Q.

In motion under gravity, let y-component of acceleration for upward motion and downward motion is ${\vec{a}}_{1}$ and ${\vec{a}}_{2}$ respectively. Then :

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a

${\vec{a}}_{1} = {\vec{a}}_{2}$

b

$|{\vec{a}}_{1}| + |{\vec{a}}_{2}| = 0$

c

none of these

d

${\vec{a}}_{1} = - {\vec{a}}_{2}$

answer is B.

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Detailed Solution

$Here, {\vec{a}}_{1} = {\vec{a}}_{2} = \vec{g}$

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