# College Physics 2.13 – Astronauts’ Conversations on the Lunar Surface

## Solution:

The total distance traveled is computed using the formula

$\text{distance}=\text{speed}\times \text{time}$

Therefore, the total distance traveled is

$\text{distance}=\left(3.00\times 10^8\:\text{m/s}\right)\left(2.56\:\sec \right)$

$\text{distance}=768\:000\:000\:\text{meters}$

Hence, the distance between the Earth and Moon is equal to the total distance traveled divided by 2.

$\displaystyle \text{Earth-Moon Distance}=\frac{768\:000\:000\:\text{m}}{2}=384\:000\:000\:\text{meters}$

The distance between the Earth and Moon is approximately 384 thousand kilometers.