Assertion: Even though net external force on a body is zero, momentum need not to conserved.
Reason: The internal interaction between particles of a body cancels out momentum of each other.
Text Solution
Verified by ExpertsThe correct answer is:
D
By Newton's second law of motion, net external force applied on a system is equal to rate of
change of momentum.
i.e. 
If 
, then 
constant
i.e. When 
, then momentum of the system remains conserved.
The internal interaction between particles of a body do not contribute to change in total momentum of body. Both Assertion and Reason are false.
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