Correct Answer - D
(d ) From the figure
Velocity of truk in north direction `v_(1)=20hatj`
Velocity ot truk in ewst dircation
`v_(2)=-20hatiimpliesDeltav=v_(2)-v_(1)=-20(hati+hatj)`
Change in velocity
`|Deltav|=20sqrt(2)` and direction will be given by
`theta=tan^(-1)(1)=45,i.e.,S-W`