Question

A body moves in a circular path of radius 20 cm if it complete two and a half revolution along the circular path then find displacement of the body

Answer 1

When it completes two complete revolution it comes back to starting point, so initial and final point becomes same, so displacement becomes zero. When it completes another half displacement the shortest path between initial and final position becomes DIAMETER of the circle, i.e Net Displacement= 2× radius= 2×20= 40cm.