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Q. 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?
(1)3 J
(2)30 kJ
(3)2 J
(4)1 J (NEET-2019)
Aditya Bhatt Answered question 22 March 2024
