A cyclist starts from the centre $O$ of a circular park of radius one kilometre, reaches the edge $P$ of the partk. Then cycles along the circumference and returns to the centre along $QO$ as shown in the figure. If the round trip takes ten minutes, the net displacement and average speed of the cyclist (in metre and kilometre per hour respectively) is

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  • A

    $0, 1$

  • B

    $\frac{{\pi  + 4}}{2},0$

  • C

    $21.4,\frac{{\pi  + 4}}{2}$

  • D

    $0, 21.4$

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A ball thrown up from a location, returns back at the same location. Which of the following statements are correct.

$(a)$ Distance travelled by ball can be zero
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  • [JEE MAIN 2023]