A projectile of mass 0.1 kg is moving with a velocity of 250 m/s. If the stored

Question:

A projectile of mass 0.1 kg is moving with a velocity of 250 m/s. If the stored energy (E) in the solid is 1.5625 kJ.
(a) Determine the specific internal energy (u). Neglect potential energy and assume the solid to be uniform.
(b) How do you explain a negative value for internal energy?