A bullet weighing 5 g takes off from the barrel of an assault rifle with an initial velocity of 700 m / s.

A bullet weighing 5 g takes off from the barrel of an assault rifle with an initial velocity of 700 m / s. Determine the kinetic energy of the bullet.

The kinetic energy of a bullet at the moment it leaves the barrel of an assault rifle can be calculated using the formula:

Ek = m * V ^ 2/2, where m is the mass of the bullet (by the condition m = 5 g = 0.005 kg), V is the velocity of the bullet when it leaves the barrel (V = 700 m / s).

Let’s make a calculation:

Ek = m * V ^ 2/2 = 0.005 * 700 ^ 2/2 = 1225 J.

All answers are wrong. Answers A and B will be correct when the bullet velocity decreases to 26.46 m / s and 209.76 m / s, respectively.