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A truck travelling due to north at `20m s^(-1)` turns west and travels at the same speed. Find the change in its velocity.

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A truck travelling due to north at `20m s^(-1)` turns west and travels at the same speed. Find the change in its velocity.
A. 40 m/s north-west
B. `20sqrt(2)` m/s north-west
C. 40 m/s south-west
D. `20sqrt(2)` m/s south-west
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Correct Answer - D
image
`vec(V)_(i)=20hat(j)`
`V_(f)=-20hat(j)`
`Deltavec(V)=vec(V)_(f)-vec(V)_(i)`
`=-20hat(j)-20hat(i)`
hance change in velcoity is `20sqrt(2)m//s` SW
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