Which best describes direct current?

a. it requires constant temperatures to flow.

b. it regularly reverses direction.

c. it requires multiple voltage sources to flow.

d. it flows only in one direction.

Initially, a particle is moving at 5.33 m/s at an angle of 37.9° above the horizontal. two seconds later, its velocity is 6.11 m/s at an angle of 54.2° below the horizontal. what was the particle's average acceleration during these 2.00 seconds in the x-direction (enter first) and the y-direction?