An \( \alpha \)-particle in a cyclotron changes its velocity from P...

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An \( \alpha \)-particle in a cyclotron changes its velocity from
P \( 30 \mathrm{~km} / \mathrm{s} \) south to \( 40 \mathrm{~km} / \mathrm{s} \) west in 10 second what is

W the magnitude of average acceleration during this time:
(1) \( 5 \mathrm{Km} / \mathrm{s}^{2} \)
(2) \( 7 \mathrm{Km} / \mathrm{s}^{2} \)
(3) \( 9 \mathrm{Km} / \mathrm{s}^{2} \)
(4) \( 11 \mathrm{Km} / \mathrm{s}^{2} \)
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