Speeds of a particle at \( 3 \mathrm{rd} \) and 8 th seconds are \( 20 \mathrm{~m} / \mathrm{s} ...

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Speeds of a particle at \( 3 \mathrm{rd} \) and 8 th seconds are \( 20 \mathrm{~m} / \mathrm{s} \) and \( 0 \mathrm{~m} / \mathrm{s} \) respectively, then average acceleration between 3rd and 8th seconds will be
(a) \( 3 \mathrm{~m} / \mathrm{s}^{2} \)
(b) \( 4 \mathrm{~m} / \mathrm{s}^{2} \)
(c) \( 5 \mathrm{~m} / \mathrm{s}^{2} \)
(d) \( 6 \mathrm{~m} / \mathrm{s}^{2} \)
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