Question

2. A truck is traveling east through mud that is slowing down its speed. With west defined as negative, which of the following is correct? A. Both its velocity and acceleration are negative. B. Both its velocity and acceleration are positive. C. Its velocity is positive but its acceleration is negative. D. Its velocity is negative but its acceleration is positive. E. Both its velocity and acceleration are 0, since both properties are vectors.

Answer 1

Hi! The answer is C

As west is defined as negative, the trucks velocity is positive, since its travelling east. But its speed (absolute value of velocity) is decreasing, that means that the acceleration is negative.