The acce le ration of the above velocity-time graph is:
(1) Non-uniform.
(2) Zero.
(3) One.
(4) Uniform.

(1)  Distance
(2)  Velocity
(3)  Speed
(4)  None of these

(1)  Scalars quantities have direction also.
(2)  Scalars can be added arithmetically.
(3)  There are special laws for scalar addition.
(4)  Scalars have special method to represent.