Consider a crash test between two identical (equal mass) cars. The cars are pull

Question

Consider a crash test between two identical (equal mass) cars. The cars are pulled at the desired speeds and then crashed. There is no acceleration due to the engine, brakes, or other interactions during the collision. The two arrows show the velocities of the cars just before the collision.
V1i= 15 m/s, V2i= - 5 m/s
Below are several possible velocities for the two cars after the collision. Which of these are physically possible outcomes for the collision? There may be more than one correct answer; you must identify them all correctly.

A) V1f = -2.5 m/s, V2f = 12.5 m/s

B) V1f = -15 m/s, V2f = 5 m/s

C) V1f = 0 m/s, V2f = 0 m/s

D) V1f = -10 m/s, V2f = 20 m/s

E) V1f = 5 m/s, V2f = 5 m/s

F) V1f = -10 m/s, V2f = 0 m/s

G) V1f = -5 m/s, V2f = 15 m/s

H) V1f = 0 m/s, V2f = 10 m/s

In solving a collision problem, how can you know that you can assume the collision is elastic?
choose one

A) You can't because no real collision is elastic.

B) The collision is between hard objects that are not distorted during the collision.

C) The collision is between single atoms because they collide without changes in their internal energy from before to after the collision.

D) The objects are moving slowly the collision doesn't make any noise

Explanation / Answer

H) V1f = -10 m/s, V2f = 20 m/s

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