The masses of two planets are in the ratio of 1:7. The ratio between their diameters is 2: 1. The ratio of forces which they exert on each other is
- A. 1:7
- B. 7:1
- C. 1:1 ✓
- D. 2:1
Correct Answer: C. 1:1
Explanation
According to Newton's Third Law of Motion and the Universal Law of Gravitation, the gravitational force exerted by one planet on the other is equal in magnitude and opposite in direction. Hence, the ratio is 1:1.
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