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Consider the following combinations of signs and values for velocity and acceleration of a particle with respect to a one-dimensional x axis:

Velocity Acceleration

a. Positive Positive

b. Positive Negative

c. Positive Zero

d. Negative Positive

e. Negative Negative

f. Negative Zero

g. Zero Positive

h. Zero Negative

Describe what a particle is doing in each case, and give a real life example for an automobile on an east-west one-dimensional axis, with east considered the positive direction.

Velocity Acceleration

a. Positive Positive

b. Positive Negative

c. Positive Zero

d. Negative Positive

e. Negative Negative

f. Negative Zero

g. Zero Positive

h. Zero Negative

Describe what a particle is doing in each case, and give a real life example for an automobile on an east-west one-dimensional axis, with east considered the positive direction.

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