A model rocket is launched from the roof of a building. For height $h$, in meters, and time $t$, in seconds, after the rocket is launched, the height of the rocket above the ground is given by $h=f(t)=-4.9 t^{2}+42 t+24$. Is the graph of $f(t)$ concave up or concave down?

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The Answer of A model rocket is launched from the roof of a building. For height $h$, in meters, and time $t$, in seconds, after the rocket is launched, the height of the rocket above the ground is given by $h=f(t)=-4.9 t^{2}+42 t+24$. Is the graph of $f(t)$ concave up or concave down?

A Model Rocket Is Launched from the Roof of a Building