Taking upward direction as positive, choose the option that correctly lists the signs (positive, zero, or negative) of the velocity v and acceleration a of a ball thrown vertically upward in the following three situations:
(i) while going up,
(ii) at the highest point,
(iii) while coming down.
The order within each pair is (v,a).
a) (i) (+,+), (ii) (0,0), (iii) (−,−)
b) (i) (+,−), (ii) (0,0), (iii) (−,−)
c) (i) (+,−), (ii) (0,−), (iii) (−,−)
d) (i) (+,+), (ii) (0,−), (iii) (−,+)