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 ?
Text Solution
Verified by ExpertsThe correct answer is:
B
work done = Δ KE
(KE) i = 
Ιω 2 + 
mv 2
= 
mv 2
= 
× 100 × (20 × 10 –2 ) 2
= 
× 100 × 400 × 10 –4
= 3J
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