AP EAMCET Engineering 2018 Apr 23 Shift 1 Paper

A bullet of mass 10 g pierces through a plate A of mass 500 g and then gets embedded into a second plate B of mass 1.49 kg as shown in the figure. Initially the two plates A and B are at rest and move with same velocity after collision. The percentage loss in the initial kinetic energy of the bullet when it is between the plates A and B is_______
(Neglect any loss of material of the plates during the collision)