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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)

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