Given the statements regarding the motion of an object with a straight line along the axis .
(1) If the average velocity of the object over an interval of 3 s is 1.5 m/s, then the average speed for the same interval of 3 s is +1.5 m/s or -1.5 m/s.
(2) If at a certain time interval, the object’s speed changes from 0 to v_x, then the average speed for that time interval is {v_x}/2.
(3) If at a certain time, the acceleration of the object’s motion is positive, then the object’s speed at the same time is also positive.
Of the three statements above, the correct statement is
a. Neither statement is true
b. (2) and (3)
c. (2)
d. (1) and (2)
e. (1), (2) and (3)