1.

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 = 10 m/s2, mass of the body 5 g)                           [JIPMER 2000]

A.             0.2 m/s
B.                      2 m/s
C.             4 m/s  
D.             4.5 \[m{{s}^{1}}\]
Answer» C.             4 m/s  


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