A projectile takes off from the gun at a speed of 800 m / s. It moved inside the trunk for 5 · 10 ^ –3 s.

A projectile takes off from the gun at a speed of 800 m / s. It moved inside the trunk for 5 · 10 ^ –3 s. The average pressure force of the powder gases is 3 · 10 ^ 5 N. Determine the mass of the projectile.

According to the law of conservation of momentum, the impulse of the pressure force of the powder gases is equal to the change in the impulse of the body, that is: F * t = m * V => m = F * t / V = 3 * 10 ^ 5 * 5 * 10 ^ -3 / 800 = 15 * 100/800 = 1500/800 = 15/8 = 2kg
Answer: about 2 kg