A shell explodes into 3 pieces. If one piece moves towards north with a momentum Pi and the second piece moves towards west with a momentum p2. The momentum of the third piece is
(a)(p1+p2)
(b)(p1^2-p2^2)^1/2
(c)(p1+p2)^1/2
(4)(p1^2+p2^2)^1/2
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