(A) : When a shell at rest explodes, the centre of mass fragments continues at rest
(R) : In explosion the linear momentum of the system does not remains conserved.

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Both 'A' and 'R' are true and 'R' is the correct explanation of 'A'

Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A'

'A' is true and 'R' is false

'A' is false and 'R' are true

answer is C.

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Detailed Solution

Since the shell is initially at rest and the explosion is entirely caused by internal forces, the system's linear momentum is conserved.
Given that the initial linear momentum of the shell was zero, the final linear momentum of the centre of mass is also zero.
As a result, the shards' centres of mass remain at rest.

Hence the correct answer is 'A' is true and 'R' is false.

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