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# An Accelerating Halfback

APPH12-4YYL3E

The college physics department attached motion sensors to a football halfback. At one instant during the big game, the sensors indicated that the halfback's instantaneous motion was -25 $\text{ m/s}^{ 2 }$, and + 9 $\text{ m/s}$.

Which of the following best describes his motion at this instant?

Note: the halfback wants to 'gain yardage', which means his goal is to move in the positive (+) direction.

A

He is gaining yardage while losing speed quickly (experiencing more than 1 'g').

B

He is losing yardage while losing speed at a moderate rate (experiencing less than 1'g').

C

He is gaining yardage while losing speed at a moderate rate (experiencing less than 1 'g').

D

He is gaining yardage, while gaining speed quickly (experiencing more than 1 'g').