I believe C is your answer (also, I am also using tht same exact program!)
Answer:
dddddddddddddddddddddddddd
Explanation:
Answer:

Explanation:
Using the conservation of energy we have:

Let's solve it for v:

So the speed at the lowest point is 
Now, using the conservation of momentum we have:

Therefore the speed of the block after the collision is 
I hope it helps you!
Answer: The answer is 3000 K and Centauri A.
Explanation:
Just did it and got it right ♡´・ᴗ・`♡