A sprinter accelerates from rest to a top speed with an acceleration whose magnitude is \( 3.80 ...
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1A sprinter accelerates from rest to a top speed with an acceleration whose magnitude is \( 3.80 \mathrm{~m} / \mathrm{s}^{2} \). After achieving top speed, he runs the remainder of the race without speeding up or slowing down. The total race is fifty meters long. If the total race is run in \( 7.88 \mathrm{~s} \), how far does he run during the acceleration phase?
(A) \( 6.85 \mathrm{~m} \)
(B) \( 9.03 \mathrm{~m} \)
(C) \( 7.62 \mathrm{~m} \)
(D) \( 13.6 \mathrm{~m} \)
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