A vehicle is traveling in the +x direction to x = 100 m.It then reverses direction.At the instant when it changes direction,the acceleration of the vehicle is
A)positive.
B)negative.
C)zero.
D)positive then negative.
E)negative then positive.

Question

Quizplus · Accepted Answer

When the vehicle changes direction, its velocity changes from positive to negative. Therefore, the acceleration must be in the negative direction to cause this change in velocity. Thus, the correct answer is B, negative.

A Vehicle Is Traveling in the +X Direction to X