Which of the following is NOT true about light waves?

1. Heat from the sun is a type of light wave
2. Human eyes can only see a limited range of light waves
3. All light waves have the same frequency
4. Light waves come in a spectrum of wavelengths

You are driving to the grocery store at 20 m/s. you are 110m from an intersection when the traffic light turns red. assume that your reaction time is 0.50s and that your car brakes with constant acceleration. how far are you from the intersection when you begin to apply the brakes? what acceleration will bring you to rest right at the intersection? how long does it take you to stop after the light changes? the known values: vi=20m/s xi=110m t=.50s vf=0m/s xf=0m a=?