A push or a pull (force) can make something move or cause it to stop. Hope this helps! :)
D.) It is unlikely that a specific cause can be determined, but the treatment would likely be the same in either case.
Answer:

Explanation:
Given
-- initial velocity
--- height
Required
Determine the time to hit the ground
This will be solved using the following motion equation.

Where

So, we have:


Subtract 30.2 from both sides





Solve using quadratic formula:

Where




Split the expression
or 
or 
Time can't be negative; So, we have:


Hence, the time to hit the ground is 1.82 seconds