Answer:
F = 0.483 N
Explanation:
Initial momentum, 
Final momentum, 
Time, t = 31 s
We need to find the force of a lead ball. We can use here the impulse momentum theorem.

F is force

So, the force is 0.483 N.
The answer is the last option
Explanation:
Answer:
option D is correct
Explanation:
cl has 17 electrons if it has 18 it becomes cl-
A mercury filled balloon would fall faster then water. Mercury is heavier.