a vechile having a mass of 500kg is moving with a speed of 10m/s. Sand is dropped into it at the rate of 10kg/min. What force is needed to keep the vechile moving with uniform speed​

Why is there friction between objects

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this

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=?