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but in my physics TB it is given that IT is not (-)tive

 but in my physics TB it is given that
IT is not (-)tive
 

Grade:8

1 Answers

Sumit Majumdar IIT Delhi
askIITians Faculty 137 Points
8 years ago
Dear student,
The first equation comes as a result of conservation of momentum. This results when the initial total momentum is equal to zero and there is no net force acting on the system. The second equation comes when the resultant vector is found in a vectorial notaion.
Regards
Sumit

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