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A body is moving with velocity \( 30 \mathrm{~m} / \mathrm{s} \) towards east. After 10 seconds its velocity becomes \( 40 \mathrm{~m} / \mathrm{s} \) towards north. The
\( \mathrm{P} \) average acceleration of the body is [CBSE PMT (Pre.) 2011]
(a) \( 5 \mathrm{~m} / \mathrm{s}^{2} \)
(b) \( 1 \mathrm{~m} / \mathrm{s}^{2} \)
W
(c) \( 7 \mathrm{~m} / \mathrm{s}^{2} \)
(d) \( \sqrt{7} \mathrm{~m} / \mathrm{s}^{2} \)
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