Answer to Question #158531 in Physics for Jonathan

Question

A radar signal took 5.1s to go to mars and return. How far away was Mars at that moment

Answer 1

The distance Earth-Marth is equal

$$d=\frac{ct}{2}=\frac{3\times 10^8\rm m/s\times 5.1\: s}{2}=7.65\times 10^8\; \rm m$$