Conservation of Momentum Answers

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In an elastic collision, energy is conserved.

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3

Which are examples of perfectly inelastic collisions? Check all that apply.a baseball bouncing off a bat bumper cars bumping off of each othera cue ball hitting an eight ball and stoppinga plane landing on an aircraft carrierrain sticking to a windowtwo train cars coupling together

A
a baseball bouncing off a bat
B
bumper cars bumping off of each other
C
a cue ball hitting an eight ball and stopping
D
a plane landing on an aircraft carrier
E
rain sticking to a window
F
two train cars coupling together
6

For a movie stunt, an empty truck with a mass of 2000 kg goes 10 m/s and runs into a stopped car of mass 1000 kg. The truck then keeps moving and pushes the car along with it.

A
The collision is perfectly elastic.
B
Kinetic energy stays the same.
C
The momentum after the collision is greater than the momentum before the collision.
D
The speed of the combined vehicles is less than the initial speed of the truck.
7

A girl is standing still in the middle of a baseball field. The girl catches the baseball and begins to move in the same direction as the thrown ball.

A
inelastic, since the girl moves in the same direction as the thrown ball
B
inelastic, since the girl moves in the opposite direction of the thrown ball
C
elastic, since the girl moves in the same direction as the thrown ball
D
elastic, since the girl moves in the opposite direction of the thrown ball
8

A rubber bullet of mass m is fired from a rifle into a stationary block of 25 m. The bullet remains in the block and both the bullet and the block move off with a common velocity. Assume this is an inelastic collision in a closed system.

A
The final momentum of the bullet/block is zero.
B
The final momentum of the bullet/block is equal to the initial momentum of the bullet.
C
The final momentum of the bullet/block is less than the initial momentum of the bullet.
D
The final momentum of the bullet/block is more than the initial momentum of the bullet.

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