Answer:
Step-by-step explanation:
number 2
Answer:
20
Step-by-step explanation:
10+10+10+10=40
40/2=20
Check the picture below
in case you want to know how to get who's the adjacent or opposite, notice in the picture, if you put your eye on the angle itself, what you'd be facing is the opposite side, the adjacent is the side touching the angle.
That would be 644.8 / 31 = 20.8 feet / second
For this we almost have the following equation:

We must match the equation to zero:

From here, we clear the value of t.
We have then:

We discard the negative root because we are looking for time:
Answer:
it will take him to reach the ground about:

seconds