Question

An athlete runs along a circular track of radius 20m. What is his displacement and distance after covering half a round?

Answer 1

Distance in circular motion = $2 \pi r$


                                           =$2 * \frac{22}{7} *20$

                                           = 125.7 m


that is a whole round

thus


half of it= 125.7/2

              = 62.9m


he covered a distance of 62.9 or 63 meter



Displacement = 2*20 = 40m


ANS Distance covered in half round is 62.9 or 63 m and displacement is 40m