After an economy has reached its peak, it begins the phase of the business cycle.
a. trough
b. contraction
c. recession
d. expansion

Select the situation bellow that would produce a total displacement of zero. a. a trip to the moon and then to mars b. a horse galloping from one end of a field to another c. the criss-crossing path of a bug as it flies from flower to flower d.a round-trip ride to school and back