Which of the following is true for projectile motion? check all that apply. a. objects in free fall are undergoing projectile motion b. objects in projectile motion can be noticeably slowed by air resistance. c. objects in projectile motion always accelerate vertically downward at g=9.8 m/s2. d projectile motion can occur in either one or two dimensions.

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