- #1

sololight

**(First homework post I've ever made, I encourage you to tell me if I typed something that does not follow policy.)**

1. Homework Statement

1. Homework Statement

Distance on the X axis from the ball's location to the field goal =

**50 m**

Height on the Y axis of the field goals height =

**4 m**

Ball's angle =

**45° θ**

## Homework Equations

Vfx = Vix + ax * t

Vfy = Viy + ay * t^2

Xf = Xi + Vix * t + 1/2 * a * t^2

Yf = Yi + Viy * t + 1/2 * a * t^2

These were provided by the teacher, he told me these were the equations that you needed to solve.

## The Attempt at a Solution

I feel like I am completely missing the point to this problem. The equations look like a huge mess to me, I am struggling to figure out which equation I must use first, my attempt was pitiful and it got nowhere but here it is:

First I just try to solve an equation that comes to mind, for instance, Vfx. Couldn't we assume that the initial velocity of x is 0? I don't know the acceleration of x nor time. So I get: Vfx = 0 + ax * t

The same goes with Vfy, I get Vfy = 0 + ax * t.

For Xf, I assume that the initial X position is 0, the initial velocity of x is 0, I don't know the time but acceleration is 9.8. I end up with 0 + 0 + 4.9 * t^2.

I get the same thing for Yf aswell.

I am clearly missing the point of this problem, I need to find all the unknowns. Perhaps I am not using enough or maybe even the correct equations. I would like to find out the time, when to use the 9.8 m/s as acceleration, and of course the answer to the original problem. All of this has been very frustrating, yet, fun at the same time. I appreciate any help.