# Homework Help: Projectile Motion of plane

1. Sep 17, 2007

### aligass2004

1. The problem statement, all variables and given/known data
A supply plane needs to drops a package of food to scientists working on a glacier in Greenland. The plane flies 116m above the glacier at a speeds of 170m/s. How far short of the target should it drop the package?

2. Relevant equations
Kinematic equations

3. The attempt at a solution
As with my other two posts, I know what I need to find. I just don't know how to go about finding it. I'm so confused about finding the components of the velocity without a given angle.

2. Sep 17, 2007

### PhanthomJay

assume it's flying horizontally, since no other info is given.

3. Sep 17, 2007

### aligass2004

I want to say that this problem is like the other one you helped me with, but I don't think that's the case.

4. Sep 17, 2007

### PhanthomJay

well, its kind of like the same, xcept in the other one, you were given x and v_x, you solved for t, then found the height. In this one, you are given h and v_y, solve for t, then find x. Sort of like the other one in reverse.

5. Sep 17, 2007

### aligass2004

Ok, I used what I did in the other problem I had. You didn't help on that one. I solved for t using Yf = Yi + Vyi(t) - 1/2 g(t^2). I got 4.863s. Then I used Xf = Xi + Vx(t) to find x, which I got to be 826.71. Thank you again!!