Physics-Motion and Gravity Help

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The discussion revolves around solving a physics problem involving projectile motion, specifically calculating the initial velocity required for a baseball to travel 90 meters at a 40º angle with a flight time of 3.9 seconds. The participant expresses confusion about the necessary concepts and equations, mentioning difficulties in applying standard formulas for velocity and gravity. Suggestions are made to consider both horizontal and vertical components of motion and to utilize kinematic equations. The participant acknowledges progress in understanding the problem after receiving guidance. The conversation highlights the challenges of tackling physics problems without clear instructions or support.
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Physics--Motion and Gravity... Help!

Homework Statement





I have this really great excercise book that gives you excercises with no explanation how to do it. The question is: For a baseball to travel 90m, with what velocity must it be hit if the angle of impact is 40º? The flight time is 3.9 sec. I have absolutely no idea how to start solving this!

Homework Equations





The Attempt at a Solution

 
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lilaSA said:
I have this really great excercise book that gives you excercises with no explanation how to do it. The question is: For a baseball to travel 90m, with what velocity must it be hit if the angle of impact is 40º? The flight time is 3.9 sec. I have absolutely no idea how to start solving this!
Welcome to PF lilaSA,

You must have some idea as to where to start, which concepts are involved?
 


What do you mean concepts? The majority of the excercises require you to solve problems in connection with the height or speed of objects, but normally they give the velocity at which it travels. I'm quite confused
 


What equations do you normally use to solve those problems? They can be used to solve this one, except this time you will be finding the initial velocity.
 


The equations they use to solve velocity is normally change in distance/change in time... I've tried that, but the answer is still incorrect. I have also tried solving it by using the gravity measurement thingy and working it into the equations, but that didn't work either. My physics teacher moved, now I'm stuck lol
 


There is another equation I just found, it is: velocity = gravity x time... Does that help?
 


OK thanks... I've gone to the link, but I still need to solve the problem using the degrees? I'm sorry, I'm quite clueless with these things
 


I think I get it now, thanks so much!
 

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