Question

A body of mass 20kg weights 34N on the moon. Find the mass of another body which weights 5100N under the same conditions.

Answer 1

First, fond the acceleration due to gravity $g$ on the moon:

$$g=\frac{P_1}{m_1}.$$

The mass of another body is

$$m_2=\frac{P_2}{g}=m_1 \frac{P_2}{P_1}=20 \cdot\frac{5100}{34}=3000\text{ kg}.$$