Question

A truck travelling due to North at 20 m/s turns East and travels at the same speed. The change in its velocity is -

Answer 1

Initial velocity $u=20\hat{i}$

Final velocity $v=20\hat{j}$

Change in velocity $\Delta v=20\hat{j}-20\hat{i}$

Magnitude $|\Delta v|=\sqrt{{20}^2+{20}^2}=20\sqrt{2}m/s$