A particle is moving with a velocity of \( 10 \mathrm{~m} / \mathrm{s} \) towards east. After \(...

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A particle is moving with a velocity of \( 10 \mathrm{~m} / \mathrm{s} \) towards east. After \( 10 \mathrm{~s} \) its velocity changes to \( 10 \mathrm{~m} / \mathrm{s} \) towards
\( \mathrm{P} \)
north. Its average acceleration is:
W
(1) zero
(2) \( \sqrt{2} \mathrm{~m} / \mathrm{s}^{2} \) towards \( \mathrm{N}-\mathrm{W} \)
(3) \( \frac{1}{\sqrt{2}} \mathrm{~m} / \mathrm{s}^{2} \) towards N-E
(4) \( \frac{1}{\sqrt{2}} \mathrm{~m} / \mathrm{s}^{2} \) towards \( \mathrm{N}-\mathrm{W} \)
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