Answer:
42/100. Simplified would be 21/50]
Step-by-step explanation:
Answer:
-1/2
Step-by-step explanation:
just trust me, idk how to explain it
For this case we have that the equation that describes the height is:

Where,
v: initial speed
c: initial height
Substituting values we have:

Then, to find the time, we use the quadratic formula:

Substituting values we have:

Rewriting:



We discard the negative root because we want to find the time.
We have then:


Answer:
D. 