imagine that two objects are falling in the sky and that their is no air resistance. A block of metal has a mass of 70kg and a piece of styrofoam has a mass of 5kg. Which of the following is true

Diamond will scratch quartz. true or false

Which of these metals are magnetic?

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=?