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A scooter starts from rest and accelerates uniformly at $2$ m/s$^2$. After $5$ s its speed is:
A$10$ m/s, by $v = u + at = 0 + 2\cdot 5$
B$25$ m/s, since $s = \tfrac{1}{2}at^2$ gives this
C$5$ m/s, equal to the acceleration times root time
D$2$ m/s, the same as the acceleration value here
Answer & Solution
Correct answer: A. $10$ m/s, by $v = u + at = 0 + 2\cdot 5$
$v = u + at = 0 + 2\cdot 5 = 10$ m/s.
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