A disc of radius 2 m and mass 100 k g rolls on a horizontal floor. Its centre of mass has speed of 20 c m s…

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-1. How much work is needed to stop it?
  1. 3 J
  2. 30 kJ
  3. 2 J
  4. 1 J

Solution

Energy of the cylinder =12mv2+12Iω2
=12mv2+12mr22v2r2
=34 mv2
=34×100×20×10-22
=3 J .

Asked in: NEET 2019 (All India)

Practice more Rotational Motion questions on Aicharya