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Gaokao Physics Practice Question

一质点做速度逐渐增大的匀加速直线运动, 在时间间隔 $\mathrm{t}$ 内位移为 $\mathrm{s}$, 动能变为原来的 9 倍。该质点的加速度为

  1. A.$\frac{2 s}{t^{2}}$
  2. B.$\frac{s}{t^{2}}$
  3. C.$\frac{3 s}{2 t^{2}}$
  4. D.$\frac{4 s}{t^{2}}$

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