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You step onto a hot beach with your bare feet. A nerve impulse, generated in your foot, travels through your nervous system at an average speed of $190 \mathrm{~m} / \mathrm{s}$. How much time does it take for the impulse, which travels a distance of $1.68 \mathrm{~m}$, to reach your brain?
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Answer

$\boxed{0.00884\mathrm{~s}}$

Steps

Step 1 ：Given the distance of $1.68\mathrm{~m}$ and the speed of $190\mathrm{~m/s}$, we can use the formula: $time = \frac{distance}{speed}$

Step 2 ：Plug in the values: $time = \frac{1.68}{190}$

Step 3 ：Calculate the time: $time \approx 0.00884\mathrm{~s}$

Step 4 ：$\boxed{0.00884\mathrm{~s}}$