The meter stick in the drawing can rotate about an axis located at the 20.0-cm mark. the axis is perpendicular to the screen. a force f acts at the left end; the force is perpendicular to the meter stick and has a magnitude of 175 n. a second force, either f1 or f2, acts at the 80.0-cm mark, as the drawing shows. the meter stick is in equilibrium. which force, f1 or f2, acts on the meter stick, and what is its magnitude?

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=?