Acceleration in 2 Dimensions-Vectors and Projectiles

1. An airplane is flying with a velocity of (150, 0) m/s. It is accelerated at 8.92 m/s2 in the x direction, and accelerated in negative y direction at 1.21 m/s2. What is the airplane's velocity at t = 3.6 s?

2. My textbook says this is a relevant equation: average acceleration = change in velocity/change in time.
ax=change in velocityx/change in time
ay=change in velocityy/change in time.

Where vx and vy are the components of velocity.

3. So, I plugged the knows (time and acceleration) into the equations and got 32.1 m/s and 4.4 m/s. But I knew it was wrong because why would they give (150, 0) m/s?

How do I solve this problem?

Doc Al
Mentor
You are finding the change in the velocity components. Use Δv = vf - vi.

Thanks Doc Al. The only issue is that I need two answers. (x,y) m/s.

Doc Al
Mentor
The only issue is that I need two answers. (x,y) m/s.
And you have two components. What's the initial velocity x-component? y-component?