A 60-kg person stands on a scale in an elevator. How many newtons does the scale read

(a) when the elevator is ascending with an acceleration of 1 m/s2;

(b) when it is descending with an acceleration of 1 m/s2;

(c) when it is ascending at a constant speed of 3 m/s;

(d) when it is descending at a constant speed of 3 m/s;