Question

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?

• A. $3J$
• B. $30J$
• C. $2J$
• D. $1J$

Answer 1

Answer: (A)

$3J$

Answer 2

The correct option is (A) :$3J$