The equation for gravitational force on a object in Earth’s gravity is Fg=(G)(m)

Question

The equation for gravitational force on a object in Earth’s gravity is Fg=(G)(m)(me) / r2

Fg is the force of gravity – newtons (N) or (Kg)(m) / s2

m & me are mass of the object and earth, respectively – kg

r is the distance between the center of gravity of the object – m

G is the gravitational constant

a) What will be the unit of G

b) Using G, What will be the equation for potential energy, U measured in Joules (J) or N-m

( i am done with letter" a" but letter 'b" i dont know how to find the equation) Can someone help me .. Thank You ...

Explanation / Answer

Potential energy equation is:

P = weitgh * height

In this case you can conver weight into mass * gravity so the equation will be:

P = mass * gravity * height

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