Physics

Problem

Which one of the following expressions correctly gives the magnitude of the gravitational force

F

between two point masses

m_1

and

m_2

whose centres are separated by a distance

r

? a)

F = \dfrac{G m_1 m_2}{4\pi r^{2}}

F = 2G\dfrac{m_1 m_2}{r^{2}}

F = G\dfrac{m_1 m_2}{r^{2}}

F = G\dfrac{(m_1 + m_2)^{2}}{r^{2}}