A particle is projected with a speed \( v_{0}=\sqrt{g R} \). The coefficient of friction between...

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A particle is projected with a speed \( v_{0}=\sqrt{g R} \). The coefficient of friction between the particle and the hemispherical plane is \( \mu=0.5 \). Then, the acceleration of the particle is
(1) \( g \)
(2) \( \frac{\sqrt{5} g}{2} \pi \)
(3) \( \sqrt{2} g \nwarrow \)
(4) none of these
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