Question : A ball is moving to and fro about the lowest point ðī of a smooth hemispherical bowl. If it is able to rise up to a height of 20 ðð on either side of ðī, its speed at ðī must be (ðððð ð = 10 ð/ð 2 , mass of the body 5 ð)
(A) 0.2 ð/ð b) c)
(B) 2 ð/ð
(C) 4 ð/ð
(D) 4.5ms^{-1}
Answer : option (B)
Solution :
