If a rock is thrownin the air and has a position equation of s(t) = -2.5t2+14t. Where position is measured in meters and time is measured in seconds.  A. at what time does the rock reach it's highest point? B. Is the rock moving up or down at t=1.5? C. is the rock speeding up or slowing down at t=4? D. At what time does the rock land?

Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter4: Polynomials
Section4.8: Rate-time-distance Problems
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If a rock is thrownin the air and has a position equation of s(t) = -2.5t2+14t. Where position is measured in meters and time is measured in seconds. 

A. at what time does the rock reach it's highest point?

B. Is the rock moving up or down at t=1.5?

C. is the rock speeding up or slowing down at t=4?

D. At what time does the rock land?

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