Posted by Sarah on Thursday, June 4, 2009 at 1:47pm.
break up the initial speed into vertical and horizontal components.
Using the horizontal component, and distance, you know how long it was in the air
375=Vicos30*time
time=375/cos30
Now, knowing time in air..
hfinal=hinitia+visin30*time-1/2 g t^2
or
vi*sin30=1/2 g t
put in for time what you got before, and then solve for vi.
so for time i got 2431 s
and i used vi*sin30=1/2 g t
vi * -.9880 = 1/2 (9.8) (2431) +.9880
= 11912.888 is this correct
Hardly. Two thousand seconds in the air?
timeinair=375ft/Vi*.866=433/Vi
Notice I am working in English units.
Vi*1/2=1/2 (33ft/sec^2)433/Vi
vi= sqrt (33*433) ft/sec
check my thinking, and work.
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