If a baseball is dropped from a skyscraper, what will its speed (velocity) be after 4.5 seconds (assuming no air resistance)?

University Physics Volume 1
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Author:William Moebs, Samuel J. Ling, Jeff Sanny
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Chapter3: Motion Along A Straight Line
Section: Chapter Questions
Problem 8CQ: Does the speedometer of a car measure speed or velocity?
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If a baseball is dropped from a skyscraper, what will its speed (velocity) be after 4.5 seconds (assuming no air resistance)?
Expert Solution
Step 1

let baseball is dropped with zero initial velocity

u=0

since there is no air resistance

a=g=9.8 m/s2

we have to calculate speed of baseball v after t=4.5 sec

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