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In Fig a sphere of radius 2 m rolls on a...

In Fig a sphere of radius `2 m` rolls on a plank. The accelerations of the sphere and the plank are indicated. The value of `alpha` is

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The correct Answer is:
3
`a_(1) = R alpha - a_(2)`
`2 = 2 alpha - 4`
`alpha = 3 "rad/s"^(2)`
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