For a particle moving along a straight line path, the displacements in the third and fifth seconds of its motion are $10 \ m$ and $18 \ m$ respectively. The speed of the particle at time $t=4 \ s$ is (in $ms^{-1}$)

  • A
    $32$
  • B
    $8$
  • C
    $12$
  • D
    $16$

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