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Question

A truck travelling due north at 20 m/s turns west and travels at the same speed. The change in its velocity be

A
40 m/s NW
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B
202 m/s NW
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C
40 m/s SW
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D
202 m/s SW
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Solution

The correct option is D 202 m/s SW
From figure

v1=20^j and v2=20^i
Δv=v2v1=20(^i+^j)
|Δv|=202 and direction θ=tan1(1)=45 i.e., S-W.

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