U1 and U2 are the strain energies stored in a prismatic bar due to axial tensile forces P1 and P2 respectively. The strain energy U stored in the same bar due to combined action of P1 and P2 will be
1
U < U1 + U2
2
U = U1U2
3
U = U1 + U2
4
U > U1 + U2
5
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