A 1200kg set of roller coaster cars is positioned at a height of 50 m. The set of cars descends 20 meters. How many Joules of Gravitational Potential Energy will the cars still posses?

Pressure is a measure of force per unit area or p=f/ap=f/a. a student is checking the amount of pressure their car exerts upon the road. the car weighs 22 tons ( us short ton ). the student finds the dimensions of each tire's footprint on the road is 12.5 cm x 16.5 cm. in pounds per square inch (psi), what is the total pressure the car exerts upon the road?