Physics

Problem

The Moon’s mass is

\dfrac{1}{100}

of Earth’s mass and its radius is

\dfrac{1}{4}

of Earth’s radius. What initial upward speed is required for a ball to rise to a height of

20\,\text{m}

on the Moon? (Use

g_{\text{Earth}} = 9.8\,\text{m/s}^2

; neglect air resistance.) a)

20\text{ m/s}

4.0\text{ m/s}

8.0\text{ m/s}

5.6\text{ m/s}