I give up. I'm stupid. Please help me with this physics problem - 10 points
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I give up. I'm stupid. Please help me with this physics problem - 10 points

[From: ] [author: ] [Date: 12-07-12] [Hit: ]
4 m/s and vx = 36.1 cos49.3 = 23.deltay = viy t + 1/2 g t^2 so -34 = 27.4 t -4.9t^2 solve for t (I use a TI-83 program called quad25,......
Okay, I'm about to cry. I have literally spent the past HOUR trying to figure this out by myself. I feel like i do everything right but NEVER EVER get the right answer. WHY AM SO STUPID???

http://i49.tinypic.com/2j0jpqa.png

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viy = 36.1 sin49.3 = 27.4 m/s and vx = 36.1 cos49.3 = 23.5 m/s

deltay = viy t + 1/2 g t^2 so -34 = 27.4 t -4.9t^2 solve for t (I use a TI-83 program called quad25, you MUST have one or you'll have to do it the long way) I got t = 6.64 or -1.05 s. Take the positive t = 6.64 s. Now find deltaX = vx t = 23.5 x 6.64 = 156 m.

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y component of velocity Vy = sin(49.3*pi/180) * 36.1 =~ 27.368
x component of velocity Vx = cos(49.3*pi/180) * 36.1 =~ 23.541

height risen = Vy^2/2g = 27.368^2/(2*9.81) =~ 38.175m
time to rise = sqrt(2*(38.175)/9.81) =~ 2.790 s
time to fall to sea level = sqrt(2*(34+38.175)/9.81) =~ 3.836s
total time = 2.790 + 3.836 = 6.626 s
horizontal distance travelled in that time = Vx * t = 23.541 * 6.626 =~ 156m
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