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MHT CET Physics question

PhysicsWork, Energy and PowerMHT CET

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 . The magnitude of the change in velocity as it reaches a position where the string is horizontal ( being acceleration due to gravity) is

Answer: (A)

Solution

At the horizontal position v² = u² - 2gl and the velocity is vertical, perpendicular to the initial horizontal velocity u, so |change| = √(u² + v²) = √(2(u² -

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Question ID VK-040741