Year: 2019
Topic: System of particles and rotational motion
Time :
1. A disc of radius 2m and mass 100kg rolls on a horizontal floor. Itscentre of mass has speed of 20cm ∕ s. How much work is needed to stopit?
(1). 1 J
(2). 3 J
(3). 30 kJ
(4). 2J