Solving Jet Plane Velocity and Acceleration using Physics Formulas

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To find the x component of the jet plane's average acceleration, use the formula a_x = (Vx_final - Vx_initial) / (t_final - t_initial). The initial velocity Vx is 625 at time 3.85 seconds, and the final velocity Vx is 838 at time 6.52 seconds. The change in time is 6.52 - 3.85 seconds. By calculating the difference in velocity and dividing by the time interval, the average acceleration can be determined. This approach clarifies the relationship between average acceleration and the change in velocity over time.
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Hi, I am stuck on this problem and its probably easier than I think, can anyone help?

At an air show, a jet plane has velocity components Vx= 625 and Vy= 415 at time 3.85 and Vx= 838 and Vy= 365 at time 6.52 .
For this time interval, find the x component of the plane's average acceleration?

What formula would I use?? Thank so much been on this question of 1hr now.. :)
 
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The x component of the acceleration is the amount by which the x component of the velocity has changed in this interval.
 
One is given two values for Vx at two times.

What is the relationship between average acceleration and change in speed over the change in time.

This might help.
http://hyperphysics.phy-astr.gsu.edu/hbase/acca.html

Please show the work.
 
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