\( \mathrm{P} \) \( \mathrm{W} \) (1) \( v_{\mathrm{E}}=30 / 2 \mat...

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\( \mathrm{P} \)
\( \mathrm{W} \)
(1) \( v_{\mathrm{E}}=30 / 2 \mathrm{~m} / \mathrm{s} \) upward
(2) \( v_{\mathrm{E}}=30 / 2 \mathrm{~m} / \mathrm{s} \) downward
(3) \( v_{\mathrm{E}}=31 / 2 \mathrm{~m} / \mathrm{s} \) upward
(4) \( v_{\mathrm{E}}=31 / 2 \mathrm{~m} / \mathrm{s} \) downward
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