What's is the question asking, true or false?
Answer:
I would say B. It rids the body of something harmful.
Explanation:
Vomiting usually tries to get rid of something bad in your stomach. If you vomit when your sick its because its trying to get rid of that sickness.
Hope this helps >:3
Answer:
Explanation:
Investigators thought this meant that oxygen was eight times more massive than hydrogen. They presumed the chem-ical form-ula for water to be H-O
Hope this helped!!! .
Answer:
av=0.333m/s, U=3.3466J
b.
Explanation:
a. let 
be the mass of block A, and
be the mass of block B. The initial velocity of A,
-The initial momentum =Final momentum since there's no external net forces.
Relative velocity before and after collision have the same magnitude but opposite direction (for elastic collisions):
-Applying the conservation of momentum. The blocks have the same velocity after collision:
#Total Mechanical energy before and after the elastic collision is equal:
Hence, the maxumim energy stored is U=3.3466J, and the velocity=0.333m/s
b. Taking the end collision:
From a above, 
We plug these values in the equation:
Depending on whether they where conjoined initially, or where born separately really changes the answer of this question. Although studies show that twins generally have a kinetic link, more practical research says that twins are 25% more likely to both be left handed, which is a recessive gene, they are also more likely to die in child birth, twins are more likely to understand and be biligual, along with many other advantages twins may have.
