Stephan is standing on the ground by a mesa in the painted desert. stephan is 1.8 meters tall and sights the top of the mesa at 29 degrees. stephan steps back 100 meters and sights the top at 25 degrees. how tall is the mesa

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=?