An object falls from the transco tower in houston and takes 15 seconds to reach the ground.
what is its velocity at impact?

Impact velocity = 147m/s

Explanation:

Impact velocity means the velocity of an object when it just falls on the ground. It is the maximum velocity obtain by an object before it stopped by something.

Given data:

Initial velocity =

Time = t = 15 s

Gravitational acceleration = g = 9.8 m/s²

Final velocity = impact velocity =

According to first equation of motion

As inial velocity is zero so

                  Impact velocity = 147 m/s

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.