試題詳解

1.An object starts from rest at the origin and moves along the x axis with a constant acceleration of 4 m/s². Its average velocity as it goes from x = 2 m to x = 8 m is:
(A) 1 m/s
(B)2m/s
(C)3m/s
(D) 5m/s
(E) 6 m/s