Our teacher’s prognosis was that if we studied we would all do fine on the test. The prefix pro- means “before,” and gnosis comes from a Greek word meaning “to know.” What is the meaning of prognosis as it is used in the sentence?
A prediction
B advice
C feeling
D understanding

the boy's acceleration toward the girl is 2.08 m/s^2.

explanation:

according the newton's third law, the force causing the girl accelerate towards the boy will be me with equal counter-force causing the boy to accelerate towards the girl. these forces will be of equal magnitude and allows us to determine the boy's acceleration:

the boy's acceleration toward the girl is 2.08 m/s^2.