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General
Easy
Question
Two balls each of mass 2 kg are fastened to the opposite ends of a massless rod of length 4 m. The rod is pivoted on a fixed axis through its centre. The ball and the rod are initially at rest. A 2 kg block moving with some initial velocity hits the lower ball and stick to it as shown in the figure. After collision, the system has an angular velocity 2 ms–1 about the pivot. The rod stops rotating when the lower mass is at the height.
- 1.2 m from its initial position
- 2.4 m from the initial position
- 4.8 m from the initial position
- Data are not sufficient for evaluating height.
The correct answer is: 2.4 m from the initial position
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