A stationary body explodes into two fragmrnts of masses m1 and m2. if momentum of one fragment is p, the energy of explosion is-1)p^2/2(m1+m2), 2)p^2/2\surd(m1m2), 3)p^2(m1+m2)/2(m1m2), 4)p^2/2(m1-m2).

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