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Q.

Assertion (A) : When a  shell projected obliquely explodes in mid air,  the centre of mass of the fragments move in the same  parabolic path as that would follow by the unexploded shell
Reason (R) : Explosion is due to internal forces and internal forces do not change the state of centre of mass
 

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a

Both A and R are correct. R is not the correct explanation of A

b

Both A and R are correct, R is the correct explanation of A

c

A is true, but R is false

d

Both A and R are false

answer is B.

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Internal forces don’t change the state of C.O.M

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