16t – 0.8t meters in t sec. A rock thrown vertically upward from the surface of the moon at a velocity of 16 m/sec reaches a height of s = a. Find the rock's velocity and acceleration at time t. b. How long does it take the rock to reach its highest point? c. How high does the rock go? d. How long does it take the rock to reach half its maximum height? e. How long is the rock aloft?

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter6: Vector Spaces
Section6.7: Applications
Problem 13EQ
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For a. I got v=16-1.6t and 1.6m/s^2, b. 10sec, c. 80m., e. 20sec

I have know idea how to solve for (d.). The answer feedback stated to solve for t when the rock is at half it's height. The correct answer is 2.93, 17.07 but I have know idea the proper steps to get to it. can you help? This way when I try a similar problem I will understand how to solve part d. Thanks

16t – 0.8t meters in t sec.
A rock thrown vertically upward from the surface of the moon at a velocity of 16 m/sec reaches a height of s =
a. Find the rock's velocity and acceleration at time t.
b. How long does it take the rock to reach its highest point?
c. How high does the rock go?
d. How long does it take the rock to reach half its maximum height?
e. How long is the rock aloft?
Transcribed Image Text:16t – 0.8t meters in t sec. A rock thrown vertically upward from the surface of the moon at a velocity of 16 m/sec reaches a height of s = a. Find the rock's velocity and acceleration at time t. b. How long does it take the rock to reach its highest point? c. How high does the rock go? d. How long does it take the rock to reach half its maximum height? e. How long is the rock aloft?
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