5. A 5 metre long wire is fixed to the ceiling. A weight of 10 kg is hung at the lower end and is 1 metre above the floor. The wire was elongated by 1 mm. The energy stored in the wire due to stretching is
(a) Zero (b) 0.05 joule
(c) 100 joule (d) 500 joule
Answer-b
(16)