Work, Power and Energy Part 2

A closed circular tube of average radius 15‌cm, whose inner walls are rough, is kept in vertical plane. A block of mass 1‌kg just fit inside the tube. The speed of block is 22m∕ s, when it is introduced at the top of tube. After completing five oscillations, the block stops at the bottom region of tube. The work done by the tube on the block is _______ J. (Given : g=10m∕ s2 )