If the velocity $v$ of a particle moving along a straight line decreases linearly with its displacement $s$ from $20\,ms ^{-1}$ to a value approaching zero at $s=30\,m$, then acceleration of the particle at $s=15\,m$ is $........$
If the velocity $v$ of a particle moving along a straight line decreases linearly with its displacement $s$ from $20\,ms ^{-1}$ to a value approaching zero at $s=30\,m$, then acceleration of the particle at $s=15\,m$ is $........$
- A
$\frac{2}{3}\,ms ^{-2}$
- B
$-\frac{2}{3}\,ms ^{-2}$
- C
$\frac{20}{3}\,ms ^{-2}$
- D
$-\frac{20}{3}\,ms ^{-2}$
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