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Q.

A shell in free space initially at rest explodes into two pieces, A and B, which then move in opposite directions. Piece A has less mass than piece B. Ignore all external forces. Identify correct statement. 
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a

Both have the same momentum after the explosion.

b

Piece B has greater magnitude of momentum after the explosion.

c

Piece A has greater kinetic energy after the explosion.

d

Both have the same kinetic energy after the explosion.

answer is C.

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Detailed Solution

Law of conservation of momentum

Both have momentum in opposite directions.

Magnitude of linear momentum is same for both the pieces.

 Kinetic energy, K=p22 m

 Piece A has greater kinetic energy as mA<mB

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