A particle is projected with a speed ${v_0} = \sqrt {gR} $ . The coefficient of friction between the particle and the hemispherical plane is $\mu  = 0.5$ . Then, the initial acceleration of the particle is

821-1933

  • A

    $g\, \uparrow $

  • B

    $g\, \leftarrow $

  • C

    $\sqrt 2 g\, \nwarrow $

  • D

    $2g\, \nearrow $

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