johnny tincap was standing on the pitchers mound ready to deliver his supersonic fast ball to the awaiting batter. from the plate to mound is ninety feet. a fan was using her stopwatch to time the ball and came up with 1.24 seconds. what was the average speed of the ball

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=?