A jet plane is flying at a constant altitude. At time t1=0t 1=0, it has components of velocity vx=90m/s, vy=110m/sv x = 90m/s, v y=110m/s. At time t2=30.0st 2=30.0s, the components are vx=−170m/s, vy=40m/sv x =−170m/s, v y=40m/s. (a) Sketch the velocity vectors at t1and t2.
How do these two vectors differ? For this time interval calculate
(b) the components of the average acceleration, and
(c) the magnitude and direction of the average acceleration.

The average acceleration over some time interval is equal to the ratio of the change in velocity over the duration of the interval , or

which can be split into the and components as

The magnitude of this average acceleration is

and its direction is such that

which corresponds to a direction of about 15.1º South of West.

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what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.