Two cars both start from rest and have the same constant acceleration. when radar is used to measure the velocity of each car, car a is found to be moving twice as fast as car b. at the instant the radar is used, car a has a displacement that is times as great as the displacement of car b.

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.