A 0.1 kg projectile travelling with a velocity of 200 m/s (represented by State-1) hits a stationary block of solid (represented by State-2) of mass 1 kg and becomes embedded (combined system is represented by State-3). Assuming momentum is conserved (there are no external forces, including gravity, on any system),
(a) Determine the velocity of the combined system (V3) in m/s.
(b) If the stored energy of the systems before and after the collision are same (that is, E1 = E2 = E3), determine the change in internal energy after the collision (U3 - U1 - U2) in kJ.