Question

A truck travelling due north at $20m{s}^{-1}$ turns west and travels with same speed. What is the change in velocity?

• A. $20\sqrt{2}m{s}^{-1}$ south-west
• B. $40m{s}^{-1}$ south-west
• C. $20\sqrt{2}m{s}^{-1}$ north-west
• D. $40m{s}^{-1}$ north-west

Answer 1

Answer: (A)

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