System of Particles and Rotational Motion - Result Question 71
78. A disc of radius and mass rolls on a horizontal floor. Its centre of mass has speed of . How much work is needed to stop it ?
[2019]
(a)
(b)
(c)
(d)
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Answer:
Correct Answer: 78. (a)
Solution:
- (a) Work done to stop the disc
change in total kinetic energy of disc
Final
Initial