An object starts from rest and falls freely for 20 meters near the surface of planet P. If the time of fall is 2.0 seconds, what is the magnitude of the acceleration due to gravity on planet P

Fracisco's game involves 3 green, 2 yellow, 4 red, and 3 black marbles. if he randomly draws three marbles from the bag, without replacement, what is the probability that he will draw yellow, and then red, and then black? a)1/192 b)1/72 c)3/220 d)1/55