Questions
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. [AIIMS 2019]
detailed solution
Correct option 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. Fext = dpdt If Fext = 0, then dpdt = 0 ⇒ p = constanti.e. When Fext = 0, 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.Hence, both Assertion and Reason are false.Talk to our academic expert!
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In the figure given the position-time graph of a particle of mass 0.1 kg is shown. The impulse at t = 2 s is :
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