2koh+h2so4 ?Which pair of chemicals most likely comes after the arrow to complete the equation

An engineer designs a roller coaster so that a car travels horizontally for 152 ft, then climbs 137 ft at an angle of 34.0° above the horizontal. it then moves 137 ft at an angle of 48.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

Explain why you think this diagram shows what happened to the carbon in the biodome.

What is friction? how does it affect the motion of an object?