Description
Explanation & Answer
Thank you for the opportunity to help you with your question!
First off, rewrite your units for answers 1-3.
5. Write a sign chart for the velocity function. The object "changing direction" means its velocity changes sign from - to + or from + to -. The object has zero velocity at t = 0, 6 seconds, but the velocity is only changing from signs, from negative to positive, at t = 6 seconds.
6. Refer to sign chart of velocity function. The object's motion to the right means its velocity is positive. Find the interval of t for which the object has a positive velocity, which is all t > 6 seconds.
7. Write a sign chart for the acceleration function directly below the velocity sign chart. When something is "speeding up," its accelerating in the same direction that it is moving. When something is "slowing down," its acceleration opposes its motion. In the math, when velocity and acceleration have the same sign, the object is "speeding up;" when they have opposite sign, the object is "slowing down." With the velocity and acceleration sign charts drawn so that they share vertical line x-values, their signs for any value of t can be easily compared.
8. Graphing the position function. First, find some simple values for position at a few inputs for t to show where the curve passes through. Then show when the position function isn't changing at t = 0, 6 at (0,3) and (6, -429). Then simply connect the points, keeping in mind the sign of the acceleration, which, for the graph of x, is concavity.
Please let me know if you need any clarification. I'm always happy to answer your questions.
Review
Review
