Kinematics Question 423
Question: A particle is moving with velocity 5 m/s towards east and it’s velocity changes to 5 m/s north in 10 seconds. Find the average acceleration in 10 seconds.
Options:
A) $ \sqrt{2}N-W $
B) $ \frac{1}{\sqrt{2}}N-W $
C) $ \frac{1}{\sqrt{2}}N-E $
D) $ \sqrt{2}N-E $
Correct Answer: B [b] $ \vec{a}=\frac{{{{\vec{V}}} _{f}}-{{{\vec{V}}} _{i}}}{{\Delta _{t}}} $
$ \vec{a}=\frac{5\hat{j}-5\hat{i}}{10} $
$ |\vec{a}|=\frac{5\sqrt{2}}{10}=\frac{1}{\sqrt{2}}m/s^{2} $
Direction North West
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