# 1-D Kinematics Problem

A California Condor is approaching its nest with a large chunk of carrion in its beak. As it approaches, it makes an upward swoop, achieving a momentary upward velocity of 12.8 m/s when the carrion falls from its mouth, hitting a cliff outcropping 32.1 m below. Determine the speed of the carrion upon hitting the outcropping.

This is a problem from Physics Classroom that I have to solve for AP Physics summer homework. I've never done physics before, so I'm finding it hard to even do basic problems.

I've tried setting v0=12.8, x=32.1, a=g=9.8 and plugging it into vf^2=v0^2+2ax.

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## Answers and Replies

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When the carrion is set loose, which way is it going? Up or down? How does gravity affect this?

The carrion goes down. I think that gravity makes it go down faster?

The carrion goes down.
No. Read the description. Just before the carrion is released the entire system bird + carrion is going UP.

I think that gravity makes it go down faster?
First it will need to slow it to a (momentary) halt.

What does this all mean with regard to the signs of $v_0$ and $g$?

Opposite signs? Since v0 goes up and g goes down

Exactly! Now you need to choose a positive direction - either up or down - and that should fix the signs for all the quantities (the distance, the velocity, and the acceleration), so you will be able to write down the equations.

Yay thanks I got the answer..