A truck travelling due to north at 20m s...

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

Text Solution

Verified by Experts

The correct Answer is:

D

`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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