posted by Nellie .
The bunny is initially hopping east at 7 m/s when it first sees the fox. Over the next half second the bunny changes its velocity to west at 12 m/s and escapes. What was the bunny's average acceleration (magnitude and direction) during this half-second interval?
If velocity and acceleration are considered positive in the east direction,
DeltaV = [-12 -7] = -19 m/s
acceleration = DeltaV/t = -19/(1/2)
= -38 m/s^2
Magnitude = 38 m/s^2, direction = west