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Algebra
Pregunta

9. The height of a ball at a given time can be mod...

9. The height of a ball at a given time can be modelled with the quadratic function 

\( h ( t ) = - 5 t ^ { 2 } + 20 t + 1 \) , where height, \( h ( t ) \) , is in metres and time, \( t \) , is in seconds. How long is the ball in the air? 

Answer

\(t = 2 + \sqrt { \frac { 21 } { 5 } }\)

Solución
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