NEET 2004 Physics question
A stone is tied to a string of length '' and is whirled in a vertical circle with the other end of the string as the centre. At a certain instant of time, the stone is at its lowest position and has a speed 'u'. The magnitude of the change in velocity as it reaches a position where the string is horizontal (g being acceleration due to gravity) is :-
Answer: (4)
Solution
At the lowest point the velocity is (horizontal). By energy conservation, at the point where the string is horizontal (height higher): , and the velocity there is vertical (perpendicular to the string). The two
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