State which of the following situations are possible and give an example for each of these: (a) an object with a constant acceleration but with zero velocity. (b) An object moving in a certain direction with acceleration in the perpendicular direction.
(a) Possible When a ball is thrown up at maximum height, it has zero velocity, although it will have constant acceleration due to gravity, which is equal to 9.8 m/s2s2. (b) Possible When a car is moving in a circular track, its acceleration is perpendicular to its direction.
