Question

a particle is moving in a circle of diameter =5m .calculate the distance covered and the displacement when it complete 3 revolutions

Answer 1

Given
diameter of the circle = 5 m
radius of the circle = 2.5 m
circumference of the circle = 2πr
                                              = 2 × 22/7 × 2.5
                                              = 15.71 cm
distance covered by the particle = 3 × 15.714
                                                        = 47.14 cm
displacement = 0 cm

Answer 2

2πr
                = 2 × 22/7 × 2.5
               = 3 × 15.714
                      = 47.14 cm