What Is the Optimal Launch Angle for Maximum Range When Landing 3 Meters Lower?

In summary, the conversation discusses finding the angle for maximum range when throwing an object at a height of 3m and catching it at a height of 0m. The suggested approach involves using two simultaneous equations, one for horizontal motion and one for vertical motion, to solve for the final (x,y) point. The initial velocity is given as 5m/s. The conversation also mentions using differentiation, but the speaker is unsure of how it would apply to this problem.
  • #1
larryboi7
8
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How can i find the angle of which an object will be thrown the farthest?

I know the angle will be 45 degrees if it were to be catched at the same height it were thrown, but what I'm looking for is the angle if it were 3meters off the ground.

Thank you for the help.
 
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  • #2
larryboi7 said:
How can i find the angle of which an object will be thrown the farthest?

I know the angle will be 45 degrees if it were to be catched at the same height it were thrown, but what I'm looking for is the angle if it were 2meters off the ground.

Thank you for the help.

Welcome to the PF. Are you familiar with how to maximize a function using differentiation? Write an equation for the range as a function of launch angle (given your offset y information). Show us your attempt at a solution so we can help.
 
  • #3
berkeman said:
Welcome to the PF. Are you familiar with how to maximize a function using differentiation? Write an equation for the range as a function of launch angle (given your offset y information). Show us your attempt at a solution so we can help.

The equation would be

initial velocity is 5m/s

0 = 3 + 5sin(x) - (1/2)gt^2

x(t) = 5cos(x) * t

I know what differentiation is but I can't see how it will work to find the angle for maximum range.
 
  • #4
larryboi7 said:
The equation would be

initial velocity is 5m/s

0 = 3 + 5sin(x) - (1/2)gt^2

x(t) = 5cos(x) * t

I know what differentiation is but I can't see how it will work to find the angle for maximum range.

I'm not understanding what you wrote, but it sounds like you can figure this out. BTW, is it thrown at 0m and caught at 2m, or the other way around?

I think you will write two equations (this is the usual way to solve this type of question): One for the horizontal motion, which has a constant velocitty. The other is the vertical motion equation, which involves the vertical pull of gravity. You will use them as simultaneous equations, and solve them for the final simultaneous (x,y) point. Does that help? Show us your work...
 
  • #5
berkeman said:
I'm not understanding what you wrote, but it sounds like you can figure this out. BTW, is it thrown at 0m and caught at 2m, or the other way around?

I think you will write two equations (this is the usual way to solve this type of question): One for the horizontal motion, which has a constant velocitty. The other is the vertical motion equation, which involves the vertical pull of gravity. You will use them as simultaneous equations, and solve them for the final simultaneous (x,y) point. Does that help? Show us your work...

it is thrown at 3m and and caught at 0 meters.
i have the equations as stated before. would you mind showing me?
 
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