# Displacement- Physics Test Question#2 Video

## A rock is thrown straight down with an Initial Velocity a 14.5 meters per second, from a cliff. What is the rocks displacement after two seconds? Acceleration due to gravity is 9.8 meters per second squared.

#### Raw Transcript

#### Hello, Everyone. Tom from everystepphysics.com I’m going to read a test problem to you. A rock is thrown straight down with an Initial Velocity a 14.5 meters per second, from a cliff. What is the rocks displacement after two seconds? Acceleration due to gravity is 9.8 meters per second squared. So let’s get started. Physics to get my menu. Scroll down to Displacement because that’s what you’ve circled. And that’s what is asked for the problem. And we scroll to what’s given and in this case velocity. Initial velocity, time, and acceleration. There’s a formula. Write that on your paper. And you have to press Alpha before enter anything in here. So we have to press Alpha. Initial Velocity is 14.5 meters per second. Is acceleration given? It is but in case it wasn’t, I’m going to show you this, you can put 9.81 in there but if you didn’t, it’s assumed that you’re supposed to know that. So I’m going to choose number 2. It goes right away to time. Alpha is two seconds. And I always show you what you’ve entered so you can change it if you want. I say it’s okay. Here’s the answer: 48.6 And they have for their answer 49 when they here for their answer 49. You’d circle that one and get an A on this problem. Pretty neat, huh? everystepphysics.com Go to my site, buy my programs, and subscribe. Thank you