What is a barrier island? a. a ridge of sand that forms between the mainland and an island connecting the island to the mainland b. a long ridge of sediment that forms when a spit closes off a bay c. a narrow bank of sand that projects into the water from a bend in the coastline d. a long ridge of sediment deposited by the longshore current and separated from the mainland

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=?