Henry Frazier
10/17/2023 · Junior High School
\( \left.6^{\circ}\right) \) Uma bola é lançada ao ar. A sua altura \( \mathbf{h}( \) metros) está relacionada com o tempo (segundos) de lançamento por meio da expressão \( \mathbf{h}(\mathbf{t})=-\mathbf{t}^{2}+\mathbf{4 t}+\mathbf{5} \). a) Em que instante a bola atinge a altura máxima? b) Qual a altura máxima atingida pela bola?
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a) A bola atinge a altura máxima em \( t = 2 \) segundos.
b) A altura máxima é de \( 9 \) metros.
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