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Problem
The length of a seconds hand in watch is 1 cm. The change in velocity of its tip in 15 s is a. zero b.
π
30
2
\frac{\pi}{30\sqrt{2}}
30
2
π
cm/s c.
π
30
\frac{\pi}{30}
30
π
cm/s d.
π
2
30
\frac{\pi\sqrt{2}}{30}
30
π
2
cm/s
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