A ball thrown up vertically returns to the thrower after \( 6 \mathrm{~s} \). Find (a) the veloc...

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A ball thrown up vertically returns to the thrower after \( 6 \mathrm{~s} \). Find
(a) the velocity with which it was thrown up,
(b) the maximum height it reaches, and
(c) its position after \( 4 \mathrm{~s} \).
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