Acar drives straight off the edge of a cliff that is h =42 m high. the police at the scene of the accident note that the point of impact is d =72 m from the base of the cliff. here the initial speed v0 is unknown. ignore air resistance. the magnitude of the gravitational acceleration is 9.8 m/s2. choose the right as positive x-direction. choose upward as postitive y-direction keep 2 decimal places in all answers. how long did it take to hit the ground?