For which of the following collisions, the external force acting on the system during collision is not appreciable as mentioned in paragraph 1

a ball striking a rigid wall (consider ball as system).

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a 5 kg mass thrown vertically up exploding during its motion (5 kg mass is the system).

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a particle hitting a rigid bar of length L lying on a frictionless surface (consider rigid bar as the system).

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two particles moving towards each other due to gravitational attraction and hitting each other (consider any particle as system).

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Solution

The correct option is B a 5 kg mass thrown vertically up exploding during its motion (5 kg mass is the system).
Only for option B there is internal force during the collision. even if the internal force is impulsive it cannot change the motion of COM. In other options the external impulsive force acts which is appreciable.

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