Answer:8
Step-by-step explanation:
When you round it depends on what number it is.
So for 7.8 it is closer to eight not seven
Answer:

Step-by-step explanation:
Let v be the speed after the collision of both the cars.
Now, momentum is given by: mass × velocity, then by equating the total momentum before and after the collision of the two cars, we get

⇒
⇒
⇒
Thus, they are moving at the velocity of 
Answer:
2.5
Step-by-step explanation:
It could be 0 and 0 which yeilds a value of 0
it could be 1 and 1 which yields a value of 2
any number from 0 to 2
Answer:
B) the u.s., china, japan
Step-by-step explanation:
With economy of around $17.4 trillion, United States holds a 22.53 percent share of global GDP in nominal terms. GDP of United states is $7039 billion more than second ranked China.