What is the force of gravity?

Question

What is the force of gravity between two 1170 kg cars separated by a distance of 23 m on an interstate highway?
____ N

Answer 1

F = GMm / r², where G = 6.674 x 10^-11Nm² / kg², M = one mass, m = the other mass, r = distance between.

 

F = G(1170)(1170)kg² / 23²m²

F = G(1368900)kg² / 529m
F = (2.587.7kg²/m²) G

F = 1.7270 x 10^-11 N