$(2006,5 M)$
(a) $200 m / s$
(b) $180 m / s$
(c) $192 m / s$
(d) $96 m / s$
Correct Answer: 12. (a)
Solution:
$$ \text { or } \quad v=\frac{100 \pi}{0.5 \pi} \text { or } \frac{92 \pi}{0.46 \pi}=200 m / s $$
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