An easier way is to use the Vy formula to find "t". When Vy=0 you have reached the highest point in the parabola. That "t" represents the time it takes the projectile to reach its peak. t=2.58s you multiply "t" 2 because the peak always occurs halfway. (t/2). This way is easier than start doing all these calculations.
@@ShareInfos516 No, 281 would be wrong. Remember, the object isn't projected from the same elevation so it's not gonna hit the ground at 20m above the ground (datum). The method suggested may be easier if projected from the same level ground. In this case, if you want to use that, then you'd have to account for the x distance it travels below the 20m mark. So the solution given in the video is correct. and that method is better because it works all the time.
Firstly, you've earned a new subscriber :) Secondly, have you tested the Casio Classwizz FX-991EX. I have also noticed that TI calcs are more popular in USA. Cheers from Montenegro! :)
@@Genieprep Thank you for your solutions and yes, for the FE, I recommend the casino fx-115ES plus (same as the 991Ex outside US) over TI 36X pro. That is if one is familiar with both. If they're used to TI 36X, they're better off sticking to that.
Good Afternoon, I noticed in the Lindeburg practice problems there was a few examples similar to the one shown in this video. In the solutions to the Lindeburg examples they multiply t by 2 because when solving for t you find the time to the apex of the projectile. Why did you not multiple t by 2?
Yes, this is the predicament that I am in right now. In the FE Practice Review Practice problems, they multiply the time (t) by 2 since the first t was shown to be the time it takes the object to get to the halfway point, or the apex??
Can I submit a question I’m having a hard time with in dynamics I’ve been 5 years out of school and I never actually took dynamics so it’s a bit confusing
Hello John, you can email me at engenieeronline@gmail.com and I will help you on how to study for the FE exam and I will also try to help you with your dynamics question. I have helped many clients pass their FE exam and they were out of school for 10-15 years. Being out of school 5 years should not be a problem, you just need to study smart and you will pass this exam. Good luck with your studying!
Hello, thank you for watching! So you can find the equations on the FE reference handbook by the NCEES, you can download it for free after you log in at account.ncees.org/login.
That is really good question and I am really glad you brought it up. It is also a very common mistake. Vy = 0 usually at the peak of the projectile, because the kinetic energy (KE = 1/2mv^2) gets converted to gravitational energy, so V= 0 at your highest point. Also your final velocity is not zero, the projectile will land with a velocity.
