To solve a problem in mechanics, we need to consider an assembly of different bodies. In this as...

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To solve a problem in mechanics, we need to consider an assembly of different bodies. In this assembly,
I. different bodies exert force on each other.
II. few selected body experiences force of gravity.
Which of the following statement(s) is/are incorrect?
(a) Only I
(b) Only II
(c) Both I and II
(d) Neither I nor II
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