A ball is moving to and fro about the lowest point 𝐴 of a smooth hemispherical bowl. If it is able to rise up to a height of 20 𝑐𝑚 on either side of 𝐴, its speed at 𝐴 must be (𝑇𝑎𝑘𝑒 𝑔 = 10 𝑚/𝑠 2 , mass of the body 5 𝑔)

Question : A ball is moving to and fro about the lowest point 𝐴 of a smooth hemispherical bowl. If it is able to rise up to a height of 20 𝑐𝑚 on either side of 𝐴, its speed at 𝐴 must be (𝑇𝑎𝑘𝑒 𝑔 = 10 𝑚/𝑠 2 , mass of the body 5 𝑔)

(A) 0.2 𝑚/𝑠 b) c)

(B) 2 𝑚/𝑠

(C) 4 𝑚/𝑠

(D) 4.5ms^{-1}

Answer : option (B)

Solution :

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