Answer:
Kiran's suggestion is
wrong because the mass of insect is very small and velocity of insect will be
same as that of motor car after collision; hence change in momentum of insect
cannot be greater than that of a motor car. Akhtar's statement is also wrong;
because the force is not due to larger velocity, it is due to change in
momentum.
Rahul's suggestion
is correct; because there is no external force on the system comprising insect
and motor car; net momentum of system is conserved in the collision; hence
i.e., change
in momentum of insect and motor car are equal and opposite. Moreover, the
action force exerted by insect on motor car must be equal to reaction force
exerted by motor car on insect.
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