For two body system, the forces they apply on each other during collision with each other are
A
external forces on the system
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B
internal forces within the system but external forces on each body
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C
external forces on the system but internal forces on each body
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D
None
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Solution
The correct option is B external forces on the system When we consider two body as one system, any interaction between them is internal. But when we consider one body (as system), the force applied by the other body is external force.