PhysicsA disc of radius 2m 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 disc of radius 2m 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. A

    2J

  2. B

    1J

  3. C

    3J

  4. D

    30 kJ

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    Solution:

    Work required = change in kinetic energy

    Final KE = 0 
    Initial KE=12mv2+122=12mv2+12mv2K2R2=34mv2

    =34 x 100 x (20 x 10-2)2=3J

    KE=3J

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