Posted by Muhammad Ahsan Khan on Thursday, January 1, 2009 at 12:06pm.
I failure to find an observation related to motion in two dimension projectile motion.
Prove That/Show that
maximum range =4Height
or
Rmax=4H
please help me thanks Ahsan Khan

Physics  bobpursley, Thursday, January 1, 2009 at 4:41pm
Professor Hu did it here. Take his derivation for max range, and height, and show that Rmax=4H
wwwhep.uta.edu/~yu/teaching/summer081441001/lectures/phys1441summer08060308.ppt 

Physics  Damon, Friday, January 2, 2009 at 8:49am
That link did not work
vertical v = Vo  gt
at the top, H, v = 0
so
t = Vo/g
then H = Vo t  .5 g t^2
H = Vo^2/g .5 Vo^2/g = .5 Vo^2/g
that t is time to the top, H, which is half the total time in the air
u = Uo constant horizontal speed
R = range = Uo *2t = 2 Uo t = 2 UoVo/g
so
H/R = .5Vo/2 Uo = (1/4) Vo/Uo
I suspect that you class has already done the angle for maximum range is 45 degrees above horizontal where Vo = Uo
so
H/R = 1/4

Physics  additional  Damon, Friday, January 2, 2009 at 8:57am
Anyway in case you have not done it, for speed S and elevation angle T:
Uo = s cos T
Vo = s sin T
for max height
t = (s/g) sin T like before
R = 2 Uo t = 2 s cos T (s/g )sin T
for max
dR/dT = 0
(2 s^2/g)(sin^2 T + cos^2 T)
or max range when T = 45 degrees and
Uo = Vo

Physics  karan, Friday, February 13, 2015 at 3:51am
i don't know the answer but how 4 the man height varies
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