PhysicsTwo identical balls ‘A’ and ‘B’ are moving with same velocity. If velocity of ‘A’ is reduced to half and of ‘B’ to zero, then the rise in temperatures of ‘A’ to that of ‘B’ is

Two identical balls ‘A’ and ‘B’ are moving with same velocity. If velocity of ‘A’ is reduced to half and of ‘B’ to zero, then the rise in temperatures of ‘A’ to that of ‘B’ is

  1. A

    3 : 4

  2. B

    4 : 1

  3. C

    2 : 1

  4. D

    1 : 1

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    Solution:

    uA=uB=u;vA=u2,vB=0; W=JmsΔθ12mv212mu2=JmsΔθ;   v2u2ΔθΔθAΔθB=vA2uA2vB2uB2=u24u202u2=3u24u2ΔθA:ΔθB=3:4

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