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Question

A truck travelling due north at 50 km/hr turns west and travels at the same speed. What is the change in magnitude of velocity (in km/hr)?

A
502
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B
50
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C
0
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D
None of these
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Solution

The correct option is B 0
There is a change in direction of the velocity vector as it turns but the magnitude remains the same.

V1=50^j;V1=50;V2=50^i;V2=50
Change in magnitude of velocity =V1V2=0

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