Mars rotates on its axis once every 1.02 days (almost the same as earth does). (a) find the distance from mars at which a satellite would remain in one spot over the martian surface. (use 6.42 x 10^23 kg for the mass of mars).
(b) find the speed of the satellite.

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.