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anyone wanna help me with a physics problem

A

aceofskies05

Senior member
14. A golfer can hit a golf ball a horizontal distance of over 300 m on a good drive. What maximum height will a 301.5 m drive reach if it is launched at an angle of 25.0° to the ground? (Hint: At the top of the flight, the ball?s vertical velocity component will be zero.)

the answer is 35, but I cant seem to figure it out. I got it all drawn out, but I feel like they dont give enough information.
 
Its just a parabola.

It accelerates downward at a constant 9.8 m's. So figure out how the the ball stays in the air, divide it by 2, the plug it into the equation that figures out the change in the y direction
 
I can do this problem, but I don't know what a fucking drive is. I'm guessing it's the horizontal distance the golf ball traveled?

wait, this is just trigonometry.

2nd edit = Nope, I don't think you haven enough information to do this problem.
 
You are missing something -- initial velocity. What you should be able to do is use the equation for vertical motion to solve for initial velocity as a function of t, and then plug that into a horizontal motion equation to solve for time. Once you have that, you can solve for initial velocity, and then the height.

If you still need help I can scan and upload a solution.
 
Originally posted by: RESmonkey
Unless drive means something different, you can't do this problem.
Click to expand...

Why not? You can solve for the initial velocity (Along the 25 degree line) and then solve for the height at its peak.
 
Damn, I came into this thread too late 🙁 Oh well, yes, find the time it's in the air and use that to find the maximum height. It takes a little bit of algebra because you're not given the velocity, but it's a pretty good intro problem. Good luck!
 
Originally posted by: tenshodo13
Its just a parabola.

It accelerates downward at a constant 9.8 m's. So figure out how the the ball stays in the air, divide it by 2, the plug it into the equation that figures out the change in the y direction
Click to expand...

Actually, for the problem, you're supposed to assume the path is parabolic. A golf ball's flight certainly is not parabolic though. Of all the "real world" physics problems, I find problems involving golf balls to be the most annoying.

edit: by combining several of the more basic equations, you can come up with an equation for range, in terms of theta and the initial velocity. Since you have theta and the range, you can solve that equation to find the initial velocity. From there, find the vertical component of velocity & you should be good for figuring out the maximum height from there.

But still, it irritates me when someone tries to treat golf ball problems as semi-realistic when the spin on the golf ball (and the dimples) have a huge affect on the flight path and range.

Oh, and 300m isn't that realistic. Here's both paths & PGA driving distances:
http://www.golfjoy.com/golf_physics/dynamics.asp
 
I swear I am in the same book as you are, actually I am in the same book as you, just did this problem yesterday I think. though, I forgot the formula on how to do it.


edit: Yes it does not take into account wind resistance or any of that, this is a basic physics class, at least for me this book is from a 1st year class
 
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