16.The length of a rod is 20 cm and area of cross-section

16.The length of a rod is 20 cm and area of cross-section 2 cm² . The Young’s modulus of the material of wire is 1.4×10¹¹ N/m² . If the rod is compressed by 5 kg-wt along its length, then increase in the energy of the rod in joules will be

(a)  8.57×10^-6                                        (b)  22.5×10^-4

(c) 9.8×10^-5                                           (d) 45.0×10^-5

Answer-a

(14)