Which statement is true about acceleration? OA.
It is the rate of change of speed per unit time.
O B.
It is the rate of change of displacement per unit time.
O C.
It is the rate of change of velocity per unit time.
OD.
It is the rate of change of position per unit time.

Ineed the answer to question 1 , i’m desperate

The air that we breath is made mostly of which gaseous molecule

Aparticle moves in the xy plane with constant acceleration. at time zero, the particle is at x = 6 m, y = 8.5 m, and has velocity ~vo = (9 m/s) ˆı + (−2.5 m/s) ˆ . the acceleration is given by ~a = (4.5 m/s 2 ) ˆı + (3 m/s 2 ) ˆ . what is the x component of velocity after 3.5 s? answer in units of m/s.