a. \(t= - \frac { 20} { 2( - 16) } = 0.625\)
b. \(- 16t^ { 2} + 20t+ 300= 0\Rightarrow t= 5\)
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Gross King
30/11/2020 · Senior High School
Delbert stands at the top of a \( 300 \) -foot cliff and throws his algebra book directly upward with a velocity of \( 20 \) feet per second. The height of his book above the ground \( t \) seconds later is given by the equation where \( h \) is in feet. \( h = - 16 t ^ { 2 } + 20 t + 300 \)
Graph the height equation on your calculator. Use your graph and a table of values to help you answer the questions.
a. When does Delbert's book pass him on its way down?
b. Write and solve an equation to answer the question: How long will it take Debert's book to hit the ground at the bottom of the cliff?
a. \(t= - \frac { 20} { 2( - 16) } = 0.625\)
b. \(- 16t^ { 2} + 20t+ 300= 0\Rightarrow t= 5\)
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