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) 5m/s(b) 0m/s(c) 2.5m/s(d) 2m/sThe question was posed to me in an interview for job.The above asked question is from Rolling Motion in chapter System of Particles and Rotational Motion of Physics – Class 11

A disc is under pure rolling motion on a horizontal surface. The speed

1.	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) 5m/s(b) 0m/s(c) 2.5m/s(d) 2m/sThe question was posed to me in an interview for job.The above asked question is from Rolling Motion in chapter System of Particles and Rotational Motion of Physics – Class 11
Answer» The CORRECT CHOICE is (a) 5m/s To ELABORATE: 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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