According to the plate tectonics model what layers form earths rigid moblie plates

You have been called to testify as an expert witness in a trial involving a head-on collision. car a weighs 1515 lb and was traveling eastward. car b weighs 1125 lb and was traveling westward at 44.0 mph. the cars locked bumpers and slid eastward with their wheels locked for 22.5 ft before stopping. you have measured the coefficient of kinetic friction between the tires and the pavement to be 0.750 . how fast (in miles per hour) was car a traveling just before the collision? (this problem uses english units because they would be used in a u.s. legal proceeding.)

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration

Multiply or divide to make this english distance conversion. 174 inches = feet (14.5, 58, 2,088, 23)