A truck travelling due north at 20 ms-1 turns west and travels with same speed. What is the change in velocity?
202 ms-1 south-west
40 ms-1 south-west
202 ms-1 north-west
40 ms-1 north-west
initial velocity 20j^ and final velocity 20(-i^)
change in velocity= ∆v⇀=-20i^--20j^
along south west