A cue ball of mass m1 = 0.325 kg is shot at another billiard ball, with mass m2 = 0.59 kg, which is at rest. The cue ball has an initial speed of v = 9.5 m/s in the positive direction. Assume that the collision is elastic and exactly head-on. show answer Incorrect Answer 25% Part (a) Write an expression for the horizontal component of the billiard ball's velocity, v2f, after the collision, in terms of the other variables of the problem.

Explanation:

If the collision is elastic and exactly head-on, then we can use the law of momentum conservation for the motion of the 2 balls

Before the collision

After the collision

So using the law of momentum conservation

We can solve for the speed of ball 1 post collision in terms of others:

Their kinetic energy is also conserved before and after collision

From here we can plug in

The solution is shown in the picture below

Explanation:

d. air pressure decreases as altitude increases.

c. magnitude and direction