Student Login

Home›Chapters›Rotational Motion PYQs›Rolling Motion›Question 65

NEET 2019 · Rolling Motion

Rolling Motion question from NEET 2019

Q65NEET 2019Easy

Rolling Motion

A disc of radius 2 m and mass 100 kg rolls on a horizontal floor. Its centre of mass has speed of 20 cm/s. How much work is needed to stop it?

Show answer and solution

Answer: (c)

Work needed = total KE of the rolling disc.
Disc: $K = \frac{1}{2}mv^2\left(1 + \frac{1}{2}\right) = \frac{3}{4}mv^2$
$K = \frac{3}{4}\times 100\times(0.2)^2 = 3$ J
So the answer is (c) 3 J.

Report a mistake

More questions on Rolling Motion

A solid sphere rolls down from top of inclined plane, 7 m high, without slipping. Its…MHT CET 2019 (3 May, Shift 1)
A solid cylinder of mass 2 kg and radius 50 cm rolls up an inclined plane of angle of…NEET 2019
The following bodies are made to roll up (without slipping) the same inclined plane from…JEE Main 2019 (9 Apr, Shift 1)
A solid sphere and solid cylinder of identical radii approach an incline with the same…JEE Main 2019 (8 Apr, Shift 2)
A particle of mass 20 g is released with an initial velocity 5 m/s along the curve from…JEE Main 2019 (12 Jan, Shift 2)
A string is wound around a hollow cylinder of mass 5 kg and radius 0.5m. If the string is…JEE Main 2019 (11 Jan, Shift 2)
A homogeneous solid cylindrical roller of radius R and mass M is pulled on a cricket…JEE Main 2019 (10 Jan, Shift 1)
A solid sphere is in rolling motion. In rolling motion a body possesses translational…NEET 2018