# Homework Help: What formulas do i use to solve this

1. Feb 15, 2017

### alex91alex91alex

1. The problem statement, all variables and given/known data

Bubba sees a bird sitting on a branch. He throws a rock at the bird. The rock is thrown at a
velocity of 6.25 m/s and an angle of 50.1º with respect to horizontal. The bird is sitting on a
branch a distance of 0.877 meters above Bubba's hand and 2.02 meters horizontally from his
hand. How high above or below the bird does the rock pass?
2. Relevant equations

3. The attempt at a solution

2. Feb 26, 2018

### kccrossen

For this problem I advise you split up your velocity into vector components and solve for Vx and Vy, where Vx=Vcosθ and Vy=Vsinθ. Then use the definition of Velocity: V=d/t and solve for that using your Vx vector component and your distance along the horizontal to find the time the rock is in the air. Then use the equation Y=Vy(t)+1/2gt^2 to find the height it climbs to at the time you solved for earlier, keeping in mind that g is your acceleration due to gravity. Then subtract the value you get for Y from the height the bird is above Bubba's hand. Let me know if this helps or I need to explain further :)

3. Feb 26, 2018

### Staff: Mentor

Hello kccrossen,

Please be aware that Physics Forums policies do not allow step-by-step solutions to homework problems to be provided. Members must do the bulk of the work themselves, so that they learn the material and are then able to solve similar problems themselves. Helpers should provide suggestions, subtle hints, and a critique of the querant's demonstrated work in order to encourage their efforts.

Please take a minute or two to look at the pinned thread, Guidelines for students and helpers, which can be found at the top of the thread list in each of the homework forums.

4. Feb 26, 2018

### haruspex

You surely have been taught some equations applicable to constant acceleration motion.
They are often referred to as the SUVAT equations. Google that if you are not familiar with the term.