Do you think that the muzzle velocity calculation was accurate? Explain carefull

Question

Do you think that the muzzle velocity calculation was accurate? Explain carefully. Questions: 1. What percentage of the initial kinetic energy was lost during the collision? Where do you think this energy went? Did it just disappear? 2. TV and movies are constantly showing that, if a bullet hits a person, that person will immediately fly backwards and break any window (or even doors and walls) that he/she were standing in front of at that time. Is this scenario possible? (Considering conservation of momentum begs the question, if the bullet has the ability to throw a person through a window, what would the recoil of the gun have done to the shooter?)

Explanation / Answer

1.the ratio of initial and final kinetic energy differed from the initial and final mass ratio by 2.7%. hence this is the percentage by which the initial kinetic energy was lost. This energy went as friction loss in the experiment. Also some part of the energy went as loss in air resistance.

2.This scenario is impossible because if the bullet gets a kinetic energy which is sufficient enough to throw away the person, then its recoil momentum must throw away the shooter with double velocity according to the conservation of momentum.

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