- #1
MissJewels
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Homework Statement
For 6.5 s, a rocket rises in a straight line oriented at 70° from the horizontal axis with a constant acceleration module of 8m/s2. Then she is goes into free fall.
Find:
a) the maximum height
b) its horizontal reach
Homework Equations
t = ( vfv - viv)/a
d = viht + (0.5)at2
I believe?
y= yi + vyot -(0.5)gt2
x= vxot
The Attempt at a Solution
so I've got these given infos:
t= 6,5
xi= 0
xf= ?
yi= 0
yf= ?
a= 8 m/s2
a) to find yf at vf=0
y= vo(sin(70))t -(0,5)(9,8)t2
But then, i wonder if i should replace gravity with acceleration, but seeing as were working with y, doesn't that mean i HAVE to use -9,8 as my g (or a) value? From what i understand, I only use 8m/s2 when i have to calculate wth the values of x? I'm confused. Someone explain that at least! I have a strong feeling I am heading in the wrong direction with my work so far. Boost me?
b) as for this one, I am guessing i have to find xf after 6,8 seconds once i find the value of v0, I'm guessing things will fall into place. But do correct me if I am wrong?