A truck travelling due north at 20 ms-1 turns west and travels with same speed. What is the changes in velocity?
20 `sqrt(2)` ms-1 south-west
40 ms-1 south west
20 `sqrt(2)` ms-1 north-west
40 ms-1 north west
How is it so?? It turns downwards.. Doesnt it mean that it turns southwest??