Given this graph plotting velocity versus time, estimate the acceleration of object A at points X and Y respectively.
A. 0 meters/second2 and -1 meter/second2
B. 0 meters/second2 and +1 meter/second2
C. 5 meters/second2 and -2 meters/second2
D. 9 meters/second2 and -1 meter/second2
E. 0 meters/second2 and +3 meters/second2
