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[" A shell at rest on a smooth horizonta...

[" A shell at rest on a smooth horizontal surface "],[" explodes into two fragments of masses "m_(1)" and "],[m_(2)" .If just after explosion "m_(1)" move with speed "],[u_(2)" .then work done by internal forces during "],[" explosion is "],[[" (1) "(1)/(2)(m_(1)+m_(2))(m_(2))/(m_(1))u^(2)],[" (2) "(1)/(2)m_(1)u^(2)([1+(m_(1))/(m_(2))],[(m_(2)-m_(1))u^(2)]]]

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