A large rock rests on the ground. Which two forces listed in the options below c

Question

A large rock rests on the ground. Which two forces listed in the options below constitute an interaction force pair?

a) The contact force on the rock due to the ground and the gravitational force on the Earth due to the rock.
b) Contact force on the ground due to the rock and the contact force on the rock due to the ground.
c) The contact force on the ground due to the rock and the gravitational force on the Earth due to the rock.
d) The gravitational force on the rock due to the Earth and the contact force on the ground due to the rock.
e) The gravitational force on the Earth due to the rock and the contact force on the ground due to the rock.

Explanation / Answer

   b) Contact force on the ground due to the rock and the contact force on the rock due to the ground.

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