A particle has an initial velocity \( 3 \hat{i}+4 \hat{j} \) and an acceleration of \( 0.4 \hat{...

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A particle has an initial velocity \( 3 \hat{i}+4 \hat{j} \) and an acceleration of \( 0.4 \hat{i}+0.3 \hat{j} \). Its speed after \( 10 \mathrm{~s} \)
(1) 10 units
(2) \( 7 \sqrt{2} \) units
(3) 7 units
(4) \( 8.5 \) units
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