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A sprayer ejects a coating of particles at $25 \mathrm{~m} / \mathrm{s}$. Calculate their velocity $8 \mu \mathrm{s}$ after leaving the nozzle. Assume the average diameter of the particles is $0.6\ \mu \mathrm{m}$ and each has a mass of $0.8\left(10^{-12}\right) \mathrm{g}$. The air is at $20^{\circ} \mathrm{C}$. Neglect the vertical component of the velocity. Note: The volume of a sphere is $\forall=\frac{4}{3} \pi r^3$.

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