Figure shows the vertical section of frictionless surface. $A$ block of mass $2\, kg$ is released from the position $A$ ; its $KE$ as it reaches the position $C$ is ................ $\mathrm{J}$

821-1992

  • A

    $180$

  • B

    $140$

  • C

    $40$

  • D

    $280$

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