Answer:
The force required is 6000
Step-by-step explanation:
Answer:
The diver will hit the water at 1.5 seconds
Step-by-step explanation:
Given

Required (Missing from the question)
When will the diver hit the water?
To do this, we simply solve for t
When the diver hits the water, the height is 0 (at that point)
So, substitute 0 for h in 

Divide both sides by -16




Split
or 
Solve for t
or 
But time (t) can not be negative.
So:

Hence, the diver will hit the water at 1.5 seconds
First make the fraction over 100
21/50(2/2) = 42/100
42/100 = 0.42
0.42 is your answer
hope this helps