A disc is under pure rolling motion on a horizontal surface. The speed of the topmost point at an instant is 5m/s w.r.t the centre of the disc. What is the velocity of the centremost point? The radius of the disc is 10cm.

A disc is under pure rolling motion on a horizontal surface. The speed of the topmost point at an instant is 5m/s w.r.t the centre of the disc. What is the velocity of the centremost point? The radius of the disc is 10cm. Correct Answer 5m/s

The speed of any point w.r.t the centre is equal to R⍵, where ‘ω’ is the angular speed & ‘R’ is the distance of that point from the centre. In pure rolling motion, we know that V = Rω, where V is the velocity of centre of mass. ∴ The velocity of centre of mass = 5m/s, since Rω = 5.
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