Find the odd one out a)planets moving on it's axis, strings of guitar (being played),motion of a ferry wheel, the vehicles moving on a straight road. b)motion of the moon around the earth, motion of the earth around the sun, motion of a merry-go-round, heart-beat in a healthy person. c)motion of a bullet fired from gun, motion of a football player in the ground, motion of a vehicle on a straight road, motion of an apple falling from a tree