A truck travelling due north at 20 m/s turns left and travels at the same speed.Then the change in velocity is................

Let the velocity vectors be v₁ = 20 m/s due North and v₂ = 20 m/s due East.

   Change in velocity = v₂  - v₁

|v_2­  - v₁| = √{v₁² + (-v₂)²} = √{20² + 20²} = 20√2 m/s

Now v_2­  - v₁ = 20√2 m/s due to south west