Question

A truck travelling due to north at $30m/s$ turns west and travels at the same speed, then the change in velocity is :

• A. $60m/s$ north-west
• B. $30\sqrt{2}m/s$ north-west
• C. $30\sqrt{2}m/s$ south-west
• D. $60m/s$ south west

Answer 1

The correct option is C $30\sqrt{2}m/s$ south-west

Initial velocity u=$30\hat{i}$

Final velocity v=$-30\hat{j}$

Change in velocity= $|-30\hat{j}-30\hat{i}|=30\sqrt{2}$ south west