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Question

A particle is moving eastwards with a velocity of $$5\ ms^{-1}$$. In $$10\ s$$, the velocity changes to $$5\ ms^{-1}$$ northwards. The average acceleration in time is:


A
Zero
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B
1/2 ms2 towards north-west
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C
1/2 ms2 towards north-west
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D
1/2 ms2 towards north
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Solution

The correct option is B $$1/\sqrt { 2 }\ ms^{-2}$$ towards north-west
$$v=\sqrt{5^2+5^2}=5\sqrt 2m/s$$
Average acceleration $$\cfrac{5\sqrt 2}{10}=\cfrac{1}{\sqrt 2}$$ towards north-west.

1174928_982256_ans_2b2ff661a2924528ae05728209ebe4be.PNG

Physics

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