Question

. A particle is moving in a circular path of radius r .The displacement after half a circle would be

Zero
π r
2 r
2π r

Answer 1

the answer is pie r (second option)

that's because 2pie r is full circle but pie r is half that's why we add 2 to the pie r

note : circumfence of half circle is not equal to semi circle because semi circle have a line segment below but not half circle