You drop a rock off a bridge. the rock's height, h (in feet above the water), after t seconds is modeled by h = – 16 t2 + 541. what is the height of the rock after 2 seconds?

Identify the correct relation showing that the radius r of the orbit of a moon of a given planet can be determined from the radius r of the planet, the acceleration of gravity at the surface of the planet, and the time τ required by the moon to complete one full revolution about the planet. determine the acceleration of gravity at the surface of the planet jupiter knowing that r = 71 492 km and that t= 3.551 days and r= 670.9 × 10^3 km for its moon europa.