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which of the following collisions is elastic? a. two trucks collide and stick together b. two...

which of the following collisions is elastic?

a. two trucks collide and stick together
b. two equal mass billiard balls moving at the same speed collide head-on and bounce back at the same speed
c. a ball bounces against the pavement, but does not return to the same height as before
d. a tennis ball is hit by a racket. a loud noise is produced.
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