A molecule of mass 89.3 atomic mass units moving at 0.80 km/s to the right, and another molecule of mass 18.0 atomic mass units moving at 0.40 km/s to the left, collide.  The second molecule has a velocity of 0.60 km/s to the right after the collision.  What is the velocity of the first molecule in km/s after the collision?

3. A ball of mass 25 g traveling east at 12 m/s bounces elastically into a 2nd ball of mass 50 that is traveling west at 4m/s. What are the final velocities and momentum of each ball? (Hint: either solve the systems of equations for momentum and energy simultaneously or come up with a relative velocity system..) Place ball 2 in a moving reference frame so that it's velocity is 0 in this reference frame. In this reference frame ball 1 has 16 m/s initial velocity. Find the final velocities in this moving reference frame. m2 V10 m1 + m2 2m1 m1 v'1F v'2F V10 m1 + m2 Don't forget to come back out of the moving reference frame at the end... (since we added velocities before this time we subtract...

A 2.5 kg car is moving towards the right at 4 m/s collides head-on with 6.5 kg car moving towards the left at 2 m/s, and they stick together. What is the velocity of combined cars after the collision?

Suppose a large ship has a momentum of 1.3 × 109 kg⋅m/s. What is the mass of the large ship, in kilograms, if the ship is moving at a speed of 49.5 km/h? And how much larger is the ship’s momentum than the momentum of a 1200-kg artillery shell fired at a speed of 440 m/s?

Can any real collision ever be truly perfectly elastic? Why or why not? (You should think about this in two ways: first consider what effects of the environment surrounding the collision might have on energy and momentum conservation; second, consider the objects themselves – how must an object react to a collision in order to be considered "perfect"?).

a South bound railroad car with mass of 13,000kg moving at 25 m/s collides and couples with a North bound second of mass 20,000kg moving at 15 m/s. What is the magnitude and direction of the common velocity of the cars after this collision>?

Consider a 50 g mass traveling at 20 m/s impacting and sticking to a 950 g mass that is initially at rest. What is the speed of the combined mass after the collision (in m/s)?

A 2-kg ball traveling eastward at 5 m/s hits a 5-kg ball moving at 1 m/s eastward.  The 2-kg ball bounces west at 3.0 m/s.  What is the speed of the 5kg ball?

Suppose a pitcher throws a ball of 0.15kg with a momentum that equals that of a 2g bullet with a speed of 1800m/s. What is the speed of the ball in km/h?

A 10 gram bullet is fired from a gun and embeds itself into a 1.0 kg block of wood. After the collision the block of wood skids away at 4.0 m/s. What was the initial speed of the bullet?