A busy chipmunk runs back and forth along a straight line of acorns that has been set out between his burrow and a nearby tree. At some instant the...

A busy chipmunk runs back and forth along a straight line of acorns that has been set out between his burrow and a nearby tree. At some instant the little creature moves with a velocity of -1.45 m/s. Then, 2.55 s later, it moves at the velocity of 1.85 m/s. What is the chipmunk's average acceleration during the 2.55 s time interval?

a: 0.16 m/s

b: 0.73 m/s

c: 1.29 m/s

d: 2.28 m/s