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A truck travelling due North at 50 km h...

A truck travelling due North at ` 50 km h^(-1)` turns Westamd travels at the same speed. What is the change in velocity ?

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The correct Answer is:
D
Here, ` v_N= 50 km h^(-1)`,
change in veloicty ` = vec _w - vec v_N = vec v_w+ (- vecv_N0`
:. Magnitude of change in velocity
` = [ | v_w |^2 + |v_N|^2]^(1//2)`
`= (50^2 + 50^2)^(1//2) = 50 sqrt 2 ` South West .
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Knowledge Check

  • A truck travelling due north at 20 m/s turns east and travels at the same speed. What is the change in velocity :

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    B
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    D
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    C
    `40sqrt(2)` m/s North-East
    D
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  • Ruhi travels 10 km towards north , turns left and travels 4 km and then again turns right and covers another 5 km and turns right and travels another 4 km . How far is she from the starting point ?

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