Two blocks with masses \( 100 \, \text{g} \) and \( 200 \, \text{g} \) are attached to the ends of springs A and B as shown in figure. The energy stored in A is \( E \). The energy stored in B, when spring constants \( k_A \), \( k_B \) of A and B, respectively satisfy the relation \( 4k_A = 3k_B \), is:
