Posted by Mel on Friday, September 26, 2008 at 1:31am.
Hey can someone help with this.
A movie stuntwoman drops from a helicopter that is 30.0 m above the ground and moving with a constant velocity whose components are 10.0 m/s upward and 15.0 m/s horizontal and toward the south. You can ignore air resistance.
What is the horizontal distance(relative to the position of the helicopter when she drops) at which the stuntwoman should have placed the foam mats that break her fall?
I got 55.5 m.
However, the part that I need help with is the graphing. I don't understand how you can graph with this little information.
Draw xt graph of her motion.
Draw yt graph of her motion .
Draw v little x  t graph of her motion.
Draw v little y t graph of her motion.

physics  bobpursley, Friday, September 26, 2008 at 2:31am
xt...constant horizontal velocity vs time leads to a linear line x on the up axis, t on the horizontal.
yt... y=1/2 g t^2 so you see 1/2 of a parabola.
vxt constant
vy=t vy=gt a line.

physics  mathilda, Sunday, October 5, 2008 at 1:36pm
How did you manage to get that 55.5 m? Please explain,
thanks

physics  Mitchell, Tuesday, September 30, 2014 at 11:26pm
y=y0+V0yt+.5Ayt^2
0=30+10t.5(9.8)t^2
0=4.9t^(2)+10t+30
Via Quadratic Formula
t=1.656s and/or 3.6969s
since t can't be negative t must equal 3.6969s
x=X0+V0xt+.5Axt^2
x=0+15(3.6969)+.5(0)t^2
x=15(3.6969)
x=55.5m

physics  Nik, Wednesday, October 1, 2014 at 2:00am
You did a misstep in your calculation as its ...
y=y0+V0yt+.5Ayt^2
0=30+10t[.5(9.8)t^2] < in bracket
so that will make this ...
0= (4.9t^(2))+10t+30
Via Quadratic Formula
t=(1.233s) and/or 3.2725s
since t can't be negative t must equal 3.2725s
*steps above*
x=15(3.2725)
x=49.5m

physics  Elysia, Friday, February 5, 2016 at 1:33am
Since you are claiming acceleration of gravity to be positive (downwards is positive), then you must record upward values to be negative.
Therefore:
a of woman= 9.8 m/s^2
upward velocity of woman= 10 m/s
helicopter height= 30 m
horizontal/ southern velocity of woman= 15 m/s
(south is going downwards, you claimed
down to be positive).
First find t:
y= y0+ v0t+ 1/2at^2
= 3010t+4.9t^2
(rearranging) > 4.9t^210t30
\ use the quadratic formula /
t= 1.656 & 3.696
\time cannot be negative so use 3.696/
Second, find x, the distance the stuntwoman lands relative to the helicopter:
x=x0+v0t+1/2at^2
x=15(3.696)
=55.5 m
Answer This Question
Related Questions
 physics  A military helicopter on a training mission is flying horizontally at ...
 Physics  A rescue helicopter drops a package of emergency ration to a stranded ...
 physics  A helicopter 8.70 above the ground and descending at 2.60 drops a ...
 physics help  A helicopter 7.60 above the ground and descending at 3.90 drops a...
 Physics  A helicopter carrying Dr. Evil takes off with a constant upward ...
 physics  A helicopter 7.60m above the ground and descending at 3.90m/s drops a ...
 physics  A helicopter is ascending (moving upwards) at a constant velocity of 8...
 Physics  A helicopter is ascending (moving upwards) at a constant velocity of 8...
 Physics  A helicopter is ascending (moving upwards) at a constant velocity of 8...
 Physics  A helicopter is ascending (moving upwards) at a constant velocity of 8...
More Related Questions