An electron is moving in a circle of radius $2 \,m$ with speed $4 \,m / s$ Find the acceleration of the electron. (in $m / s ^{2}$)

  • [AIIMS 2019]
  • A

    $8$

  • B

    $4$

  • C

    $16$

  • D

    $10$

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  • [KVPY 2016]

A particle describes a horizontal circle in a conical funnel whose inner surface is smooth with speed of $0.5 \,m/s$. What is the height of the plane of circle from vertex of the funnel ........ $cm$