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A carpenter on the roof of a building accidentally drops her hammer. As the hammer falls it passes two windows of equal height, as shown in FlGURE $2-39$ . (a) Is the increase in speed of the hammer as it drops past window 1 greater than, less than, or equal to the increase in speed as it drops past window 2$?$ (b) Choose the best explanation from among the following:\begin{equation}\begin{array}{l}{\text { I. The greater speed at window } 2 \text { results in a greater increase in }} \\ {\text { speed. }} \\ {\text { II. Constant acceleration means the hammer speeds up the }} \\ {\text { same amount for each window. }} \\ {\text { II. The hammer spends more time dropping past window 1. }}\end{array}\end{equation}

(a) Greater(b) Statement III

Physics 101 Mechanics

Chapter 2

One-Dimensional Kinematics

Motion Along a Straight Line

Yeora J.

January 20, 2021

A carpenter on the roof accidentally drops the nail that hits the ground after 2.5 seconds. How high is the roof? What is the velocity of the nail just before hitting the ground?

Rutgers, The State University of New Jersey

University of Michigan - Ann Arbor

Hope College

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Okay, so in this problem we have a homer falling down and he passes for two windows. That's car, window one and window, too. The windows had the same height, and the problem wants us to tell if the increase in speed and window one is going to be equal greater than lesser than the increase in speed and window to this is the first item and the second itin. We have three statements and we need to tell which one of them er has the best explanation for this problem. Okay, so we know that even so, we have a constant acceleration, their hammer and window one. It's going to pass slowly, then in window, too, because we know in the window, too. He has a bigger speed. So he going to pass for the window much faster than in the window one. So if we consider just that time the change in velocity in window to me is going to be bigger, because what's the question? We used to describe velocity as a function of time? We just use V equals be zero. Tell us, Jeanty. So the miners v zero is the change in velocity we want to discover doubt v So this is going to be equal g t. So, since we already agreed at the time in Window one is much bigger then the time and the window, too. We know precisely that the difference in velocity off the difference in speed off Window one is going to be bigger than the increase in speed off the window. Truth, this is the answer. So let's look to this statement now. The first a statement is the greatest Peter Window tune results in a greater increase of speed About this. We already proved that is wrong because the speed is going to increase based on the time and not their celebration, because acceleration is constant. So Delta V. One it's going to have g do you want and out of E two going to have Jew T too. So what's what matters? Here is the time and not ah, the gravity. So the second statement is constant acceleration, Mr Hammond, Speed is up at the same amount for each window. Well, obviously is. It is wrong. And a turd statement the hammer. Spain's more time dropping fast window one. And that's the answer. Is this statement? Three. This is the answer for

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