An object is shot straight up from the ground with an initial velocity of 20 m/s. How high above the ground is the object one second after it reaches its maximum height? Neglect air resistance." I got the maxiumum height of 20.41 m but I used it into the y(t) = y0 + v0t - 1/2gt^2 equation and I don't think I got it righ

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter3: Motion In Two Dimensions
Section: Chapter Questions
Problem 42P: A landscape architect is planning an artificial waterfall in a city park. Water flowing at 1.70 m/s...
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"An object is shot straight up from the ground with an initial velocity of 20
m/s. How high above the ground is the object one second after it reaches its maximum height? Neglect air resistance." I got the maxiumum height of 20.41 m but I used it into the y(t) = y0 + v0t - 1/2gt^2 equation and I don't think I got it right :(

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