Mountain Biking on Mars

With your knowledge of Newton's Law of Gravitation and your experience with the activity above, consider the following scenario. The mountain biker begins on Earth but soon tackles a Planet called "Sanctuary" which is the same size as Earth but is twice as massive. Later he discovers Planet "P" which is half the size of Earth but equally massive. Describe below how you would expect his weight to vary on these two new planets as compared to on Earth.


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