A particle initially at rest is subjected to two forces. One is constant, the other is a retarding force proportional to the particle velocity. In the subsequent motion of the particle :

  • A

    the acceleration will increase from zero to a constant value

  • B

    the acceleration will decrease from its initial value to zero

  • C

    the velocity will increase from zero to a constant value.

  • D

    Both $(B)$ and $(C)$

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