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Vector Addition

A body moves ...

Question

A body moves due East with velocity 20 km/hour and then due North with velocity 15 km/hour. The resultant velocity

A

5 km/hour

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B

15 km/hour

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C

20 km/hour

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D

25 km/hour

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Solution

The correct option is D
25 km/hour

Resultant velocity $= \sqrt{20^{2} + 15^{2}}$
$= \sqrt{400 + 225} = \sqrt{625} = 25 k m / h r$

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