Two horses begin at rest. after a few seconds, horse a is traveling with a velocity of 10m/s west, while horse b is traveling with a velocity of 13m/s west. which horse had greater acceleration? a. horse a because its change in velocity was greater than horse b in the same time. b. horse b because its change in velocity was greater than horse a in the same time. c. horse b because its change in velocity was the same as horse a's, but it took less time. d. both horses had the same acceleration.