If a projectile is launched vertically upward from the ground with an initial velocity of 80ft per​ sec, neglecting air​ resistance, its height s​ (in feet) above the ground t seconds after projection is given by s=−16t2+80t. Which equation should be used to determine the time at which the height of the projectile reaches10​ft?

College Algebra (MindTap Course List)
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ISBN:9781305652231
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Chapter4: Polynomial And Rational Functions
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If a projectile is launched vertically upward from the ground with an initial velocity of 80ft per​ sec, neglecting air​ resistance, its height s​ (in feet) above the ground t seconds after projection is given by
s=−16t2+80t.
Which equation should be used to determine the time at which the height of the projectile reaches10​ft?
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