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>> $A body is moving with velocity 30 m/s to$

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A body is moving with velocity 30 m/s towards east. After 10 seconds its velocity becomes 40 m/s towards north. The average acceleration of the body is

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Initial velocity $u = 30 \hat{i}$
Final velocity   $v = 40 \hat{j}$
Change in velocity $Δ v = 40 \hat{j} - 30 \hat{i}$
Magnitude    $∣ Δ v ∣ = 3 0^{2} + 4 0^{2} = 50$
Average acceleration   $a = \frac{∣ Δ v ∣}{Δ t} = \frac{5 0}{1 0} = 5 m / s^{2}$

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