A disc is rolling the velocity of its centre of mass is V_ cm then which one will be correct : -

NEET 2001 Physics question

A disc is rolling the velocity of its centre of mass is then which one will be correct : -

(1)The velocity of highest point is and point of contact is zeroCorrect
(2)The velocity of highest point is and point of contact is
(3)The velocity of highest point is and point of contact is
(4)The velocity of highest point is and point of contact of contact is

Answer: (1)

Solution

For pure rolling, . The velocity of any point is the vector sum of and the rotational velocity about the centre. Highest point: both are in the same direction, so V_{cm}$ +

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Question ID VK-088767