A speed skater moving to the left across frictionless ice at 8.8 m/s hits a 4.7-meter-wide patch of rough ice. She slows steadily, then continues on at 6.0 m/s. What is the magnitude of the acceleration experienced by the skater during the slowdown?
a. 0.52 m/s²
b. 1.42 m/s²
c. 2.18 m/s²
d. 3.12 m/s²