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1. b

2. a deadly disease

4. at the same time

5. a) true

b) true

c)false?

d)false?

7. para.1 = c

para.2 = d

para.3 = f

para.4= b

para.5= e

para.6 = a

two 125 kg bumper cars are moving toward each other in opposite directions. car x is moving at 10 m/s and car z at −12 m/s when they collide head-on. if the resulting velocity of car z after the collision is 10 m/s, what is the velocity of car x after the collision?