An object thrown straight up falls back and is caught at the same place it is launched from. Its time of flight is T; its maximum height is H. Neglect air resistance. What is its average velocity for the second half of the trip

The average velocity for the second half of the trip is -2H/T

Explanation:

Given;

time of flight as T

maximum height as H

The maximum height of the flight is given by;

Therefore, the average velocity for the second half of the trip is -2H/T

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.