In the following, use the position function s(t) = -16t^2 + v0t + s0 for free falling objects. A ball is thrown straight down from the top of a 210 foot building with an initial velocity of -64 feet per second. What is its velocity after 3 seconds? What is its velocity after falling 80 feet?

College Physics
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ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
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In the following, use the position function s(t) = -16t^2 + v0t + s0 for free falling objects. A ball is thrown straight down from the top of a 210 foot building with an initial velocity of -64 feet per second. What is its velocity after 3 seconds? What is its velocity after falling 80 feet?
Expert Solution
Step 1

The equations of motion are :  

v = u + a ts = u t + 0.5 at2 v2 = u2 + 2 a s 

where, u is the initial velocity, v is the final velocity, a is the acceleration, t is the time, s is the distance. 

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