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JEE Main Physics question

PhysicsWork, Energy and PowerJEE Main

The mass of a pendulum bob is 200 gram and the string is 2 metre long. The bob is held so that the string is horizontal, and it is then allowed to fall. The K.E. of the bob when the string makes an angle of 45° with the vertical is J. (Take g = 10 m/s² and √2 = 1.41)

Answer: 2.82

Solution

Height through which the bob falls from the horizontal position to the 45° position: h = l sin45° =

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Question ID VK-154225