ANSWER:
26.75 newtons
STEP-BY-STEP EXPLANATION:
Given:
Mass (m) = 7kg
Force of gravity on Earth = 9.8 m/s^2
Therefore, the force of gravity on Mars would be:
[tex]\begin{gathered} g_m=0.39\cdot g_e=0.39\cdot9.8 \\ g_m=3.822\text{ m/s}^2 \end{gathered}[/tex]Weight equals mass times the force of gravity, so:
[tex]\begin{gathered} W=m\cdot g \\ \text{ We replacing} \\ W=7\cdot3.882 \\ W=26.75\text{ N} \end{gathered}[/tex]The weight on Mars is 26.75 newtons.