Question. 75 states that a parachutist falling vertically at a conference fee of 10 meters per second drops a pen 9 20 meters above the ground. What is the speed of the knife just before it reaches the ground? It's when they're interested here. Sorry. Three initial velocity V not is 10 meters per second. Um, yes. So the first thing we should do establish a positive direction this time, I'll say my positive direction is downward is that's the direction that the night will be moving at. And so, um, going to solve for final velocity, right? So that the expression of final velocities downward equal. Sorry, we not plus g t right here. All these terms a positive because everything's falling in the downward direction. I don't know time, though, unfortunately. So I should look at my other key magic equation to solve for time, not tea plus 1/2 g t squared. I have d I happy. Not so I can substitute these eyes in find Make it 20 plus 10 t plus g over two times t squared. This is a quadratic formula. Gonna I'm not gonna solve it here. However, use whatever you'd like to use to solve these questions. Typically, I use excel, but again, whatever you like to use and as long as you establishes the contract formula and you provide a solution that is typically sufficient. However getting use what if you believe it required It is required to show that work, and you should show hey, solve the quadratic formula. If you do, you get a positive solution of 1.24 seconds. So then, by substitute is in back to my original equation, I find that my final velocity is simply 10 meters per second plus 9.8 tires, 1.24 seconds, which is 22.2 meters per second. Or, if we want to get their single digits, baby 20 meters per second. Because again it is only one secret. Did you write it?