Aplane is flying east at 115 m/s. the wind accelerates it at 2.88 m/s^2 directly northwest. after 25.0s, what is the magnitude of the velocity of the plane?

81.8 m/s

Explanation:

The initial velocity of the plane is:

(toward east)

So, decomposing along the x- and y- directions:

(we took east as positive x-direction and north as positive y-direction)

The acceleration is

(northwest, so the angle with the positive x-direction is 135 degrees)

Decomposing it along the two directions:

So the two components of the velocity after a time t = 25.0 s will be

So, the magnitude of the velocity of the plane will be

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me