How long will it take an object dropped from a window to fall a distance of 78.4 meters?

What type of light does this light bulb produce most (i.e. at what wavelength does the spectrum have maximum intensity)?

What makes thermal imaging cameras useful? they can detect differences in color. they can detect differences in wave speeds. they can detect differences in temperature. they can detect mechanical waves.

Who was the first scientist to measure speed as distance over time?