A bullet flying at a speed of 400 m / s hits the shaft and travels to a stop of 0.5 m

A bullet flying at a speed of 400 m / s hits the shaft and travels to a stop of 0.5 m. Determine the resistance force of the shaft to the movement of the bullet

The work of the resistance force of the obstacle A is equal to the kinetic energy of the bullet:

A = E = M V ^ 2/2,

where M is the mass of the bullet;

V is the bullet velocity; V1 = 400 m / s.

On the other hand, work A is equal to the product of the average resistance force F by the thickness of the bullet recess in the shaft s = 0.5 m:

A = Fs.

Obstacle resistance force F:

F = A / s = M V ^ 2 / (2 s) = M × 400 ^ 2 / (2 × 0.5) = 160,000 M, H (mass M – in kg).