About Chanda Walker Expertise I can answer word problems involving mathematics at the high school and college level. I particularly enjoy calculus word problems. Please don't just type the math problem without comments. If you don't tell me what problem your having, I can't help.
Experience Have done word problems as a tutor and as a student of mathematics and physics for years.
Organizations Sigma Xi
Education/Credentials Optical Science PhD
Past/Present Clients I've answered hundreds of questions here at AllExperts.com in algebra, physics and general math sections.
Word Problems - Using a Quadratic Function in an Application
Expert: Chanda Walker - 3/21/2009
Question If an object is propelled upward from ground level with an initial velocity of 48.6 feet per second, its height,"h", in feet, "t", seconds later is given by the equation
h=-16t^2 + 48.6t. After how many seconds does the object hit the ground?
Answer h = -16t^2 + 48.6 t
We need to solve this such that h=0.
0 = -16t^2 + 48.6 t
0 = t(-16t + 48.6)
t = {0, 48.6/16}
t = 0 is the beginning time and not the solution we are looking for.
