Question : A cyclist starts from the centreπ of a circular park of radius 1 km, reaches the edge π of the park, then cycles along the circumference and returns to the point π as shown in figure. If the round trip takes 10 min, the net displacement and average speed of the cyclist (in meter and kilometer per hour) are
(A) 0, 1
(B) 214,\dfrac{\pi +4}{2}
(C) \dfrac{\pi +4}{2} ,0
(D) 0, 21.4
Answer : option (D)
Solution :
