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Q 17.      Akhtar, Kiran and Rahul were riding in a motorcar that was moving with a high velocity on an expressway when an insect hit the windshield and got stuck on the windscreen. Akhtar and Kiran started pondering over the situation. Kiran suggested that the insect suffered a greater change in momentum as compared to the change in momentum of the motorcar (because the change in the velocity of the insect was much more than that of the motorcar). Akhtar said that since the motorcar was moving with a larger velocity, it exerted a larger force on the insect. And as a result the insect died. Rahul while putting an entirely new explanation said that both the motorcar and the insect experienced the same force and a change in their momentum. Comment on these suggestions

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Kiran’s observation:-   The insect experiences a greater change in its velocity as the mass of insect is much less as compared to the motorcar so it experiences a greater change in its momentum. Thus Kiran's observation is correct. 

Akhtar’s observation:-   We know that motorcar has larger velocity and has a bigger mass as compared to the insect. Also, the motorcar continues to move in the same direction even after the collision. This suggests that the change in momentum of motorcar is very less, whereas the insect experiences great change in its momentum.

Rahul’s observation:-   The momentum gained by the insect is equal to the momentum lost by the motorcar (law of conservation of momentum). Thus his observation is also correct. 

Posted by

Devendra Khairwa

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