Not sure what you mean but I think you are either talking about a lunch box or a thermos
Answer:
De cual Tema??? jajaja no se que necesitas
Force exerted by the bullet = mass * acceleration = 0.013 * 850 = 11.05 Newtons.
the rifle exerts same force in opposite direction so we have
11.05 = 3.5 * a
acceleration = 11.05 / 3.5 = 3.16 m /s^-2
