What is said to be in a state of equilibrum

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?

What’s #16 asking me and how do i solve it?

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)