question_answer

A truck travelling due north at 20 ms turns west and travels with same speed. What is the change in velocity?

A) \[20\sqrt{2\,}\,m{{s}^{-1}}\]south-west

B)  40 ms-1 south-West

C)  \[20\sqrt{2\,}\,m{{s}^{-1}}\] north-west

D)  \[40\text{ }m{{s}^{-1}}\] north-west

Correct Answer: A

Solution :

                                         Change in velocity\[=\sqrt{{{(20)}^{2}}+{{(20)}^{2}}}=20\sqrt{2}\]along north-east or south-west