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the planet neptune has a mass of 1.02 x 10^26 kg, and earth's mass is 5.97 x 10^24 kg. what is the gravitational force between the planets when they are 4.5 billion kilometers apart?

A: 2.0 x 10^15
B: 2.0 x 10^21
C: 3.0 x 10^25
D: 3.0 x 10^31

Respuesta :

Newton's law of universal gravitation:
F=GmM/r²
F=(6.67×10^-11)×(1.02×10^26)×(5.97×10^24)/4500000000²
F=2.0×10^21

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