15. A 0.050 kg bullet is fired with an initial velocity of 200 m/s at a 5 kg bail of hay at Test on a rough surface. The bullet penetrates and embeds itself in the hay and the bullet
and hay move off at some speed. The coefficient of friction between the hay and the
surface is 0.4.
a) What is the combined speed of the bullet and hay immediately after impact?
b) How far does the hay slide before coming to rest?

The answer would be b

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.

Gas will most likely  fill the container