Question

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

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

Answer 1

Answer: (A)

$20 \sqrt{2} \,ms ^{-1}$ south-west

Answer 2

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