1.

A sphere fo mass m makes SHM in a hemispherical bowl ABC and it moves from A to C and back to A via ABC, so that PB = h. If acceleration due to gravity is g, the speed of the ball when it just crosses the point B is A. `2gh`B. `mgh`C. `sqrt(2gh)`D. `(gh)/(2)`

Answer» Correct Answer - C
Potential energy at A is converted into K.E. at B
`thereforemgh=(1)/(2)mv_(B)^(2),V_(B)^(2)=2gh,v_(B)=sqrt(2gh)`


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