2. After being fired by a marble launcher at an angle of 38°, the marble reaches a maximum height of 1.4 m above the exit of the barrel. What was the velocity of the marble when it
left the launcher?

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.