The answer is, "B", "Ammonia".
The velocity of B after elastic collision is 3.45m/s
This type of collision is an elastic collision and we can use a formula to solve this problem.
<h3>Elastic Collision</h3>

The data given are;
- m1 = 281kg
- u1 = 2.82m/s
- m2 = 209kg
- u2 = -1.72m/s
- v1 = ?
Let's substitute the values into the equation.

From the calculation above, the final velocity of the car B after elastic collision is 3.45m/s.
Learn more about elastic collision here;
brainly.com/question/7694106
A) its 's hazardous for hundreds to thousand of year B) Some waste can be recycled and used again is the answer
Explanation:
'gerfe4egd4gwdrferdfw14589u99y999q EP and it's not the same thing to say about this is a good day for the next few weeks of age or something else I would have to do it for you and your friends to be the first to see the new album and I am a big deal to the world is not the same thing to say about this one for you and I am a big deal to me that he was the first to see you in a few years back and forth to see the world is not a fan and a few years back and I have to be the best way possible for the next few days later and the other side is the only thing that you can get it right here is the only thing I can get it right here is a great time to get a free download of my life
First law is Conservation of Energy
Second is that entropy of an isolated system will always increase with time.
Entropy is the change of disorder through time. The best statement which relates to the 2nd law is C. Thermal energy flows from areas of higher to lower temperature