Two students standing apart in a classroom have a gravitational force of attraction between them of 3.20 x 10-8 n. if one student has a mass of 50.0 kg and the other has a mass of 60.0 kg, what is the distance between the students?

Using:

F = GMm/r²

r = √(GMm/F)                       

F = 3.2*10⁻⁸ N, M = 60 kg,  m = 50 kg, G = 6.673*10⁻¹¹ Nm²kg⁻²

r = √(GMm/F)  

r = √(6.673*10⁻¹¹*60*50/3.2*10⁻⁸ )   Use a calculator.

r ≈ 2.5011 m

The distance between the students is ≈ 2.5 m.