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NASA launches a rocket at $t=0$ seconds. Its height, in meters above sea-level, as a function of time is given by $h(t)=-4.9 t^{2}+223 t+241$.$\newline$Assuming that the rocket will splash down into the ocean, at what time does splashdown occur?$\newline$The rocket splashes down after $\square$ seconds.$\newline$How high above sea-level does the rocket get at its peak?$\newline$The rocket peaks at $\square$ meters above sea-level.