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QAIPMT-2003-Ph-2726: NEET 2003 Physics - Class 11 AIPMT-2003-Ph-2726 Solution: A stone is tied to a string of length l and is whirled in a…
A stone is tied to a string of length l 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
Multiple Choice Options
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- B
- C
- D
Step-by-Step Verified Solution
The total energy at A = the total energy at B
_ 1 2 m u 2 = 1 2 m v 2 + m g l
_ v = u 2 _ 2 g l
The change in magnitude of velocity = u 2 + v 2
= 2 ( u 2 _ g l )