You throw a ball downward with an initial speed of 10 feet per second out of a window to the ground 20 feet below. How long will it take to hit the ground
You throw a ball downward with an initial speed of 10 feet per second out of a window to the ground 20 feet below. How long will it take to hit the ground
Well, this is a simple free-fall problem. We have an initial speed and a vertical distance, so, we use our traditional kinematic formulas to solve the problem:
First, we record what we have:
Now, if there are 2 or less question marks, we can solve the problem, so it looks solvable.
The next part would be to pick the correct equation, A first step would be to find the final velocity, this equation is perfect for that:
Now we plug in what we know:
Now, we use what we have now to find the time, this equation is simple and elegant:
And there you go.