Question

A particle went around a circular track of radius 12.0 m. It traveled one and a half revolution in under 29.4 s. What is the distance travelled and the magnitude of displacement of the particle?(in meters)

Answer 1

Displacement is the shortest distance travelled from the initial point to the final point. After half revolution the displacement is the length of the diameter which is equal to 2r. Hence the displacement is 2r.