1. Momentum-Impulse Theorem Collision:
If no external force, momentum always conserved.

2. Is the kinetic energy conserved?
Inelastic collision
Completely inelastic collision: stick together

3. Elastic collision
If v1i ,v2i is same direction

4. Object sticks to together:
1200-kg car moving at 2.5 m/s is struck in the rear by a 2600-kg truck moving at 6.2 m/s. If the vehicles stick together the collision, what is their speed immediately after colliding? (assume that external forces may be ignored).
2600 kg
1200 kg
6.2 m/s
2.5 m/s vf

5. Ballistic Pendulum
In a ballistic pendulum, an object of mass m is fired with an initial speed v0 at the bob of a pendulum. The bob has a mass M, and is suspended by a rod of negligible mass. After the collision, the object and the bob stick together and swing to through an arc, eventually gaining a height h. Find h in terms of m, M, v0, and g

7. collision in 2D
m1=950 kg
m2=1300kg
Completely Inelastic collision

8. Elastic collision: Find the final velocity of the car? 135 kg 96 kg
1.24 m/s
0 m/s
Find the final velocity of the car?