A particle has initial velocity \( 4 i+4 j \mathrm{~m} \mathrm{~s}^{-1} \) and an acceleration \...

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A particle has initial velocity \( 4 i+4 j \mathrm{~m} \mathrm{~s}^{-1} \) and an acceleration \( -0.4 i \mathrm{~m} \mathrm{~s}^{-2} \), at what time will its speed be \( 5 \mathrm{~m} \mathrm{~s}^{-1} \) ?
P
(1) \( 2.5 \mathrm{~s} \)
(2) \( 17.5 \mathrm{~s} \)
W
(3) \( s \)
(4) \( 8.5 \mathrm{~s} \)
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