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)=4.9t2+190t+318 Assuming that the rocket will splash down into the ocean, at what time does splashdown occur? The rocket splashes down after _____ seconds. How high above sea-level does the rocket get at its peak? The rocket peaks at _________ meters above sea-level.