A ball is thrown vertically upward with an initial velocity of $150 \mathrm{~m} / \mathrm{s}$. The ratio of velocity after 3s and 5s is $\frac{x+1}{x}$. The value of $x$ is $\_\_\_\_$ .
Take $\left(\mathrm{g}=10 \mathrm{~m} / \mathrm{s}^2\right)$.
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