A Heavy Crate Containing Artworks from the National Gallery of Victoria

Multiple Choice

A heavy crate containing artworks from the National Gallery of Victoria is to be shipped to London to be part of an exhibition. The artworks are securely fastened in a cubic crate 1 m on a side. This crate is placed on top of a rubber mat in the back of a cargo plane. The rubber mat has an uncompressed thickness of 1 cm and a Young's Modulus of 100 000 N m-2. When the crate is placed on the rubber, the mat is compressed by 0.1 mm. How much elastic energy is stored in the rubber in this situation?

A) 0.025 J.
B) 0.25 J.
C) 2.5 J.
D) 25 J.
E) 250 J.