A person walks 20km towards the South, then 15km towards the East. What is his net displacement?
Q1. A person walks 20km towards the South, then 15km towards the East. What is his net displacement?
Answer: √(20² + 15²) km
Explanation: Use Pythagoras' theorem: √(20² + 15²) = √(400 + 225) = √625 = 25 km.