Which of the following is the best explanation of work? A. Work occurs when energy acts on an object.

B. Work occurs when a force acts on an object.

C. Work occurs when energy is exerted.

D. Work occurs when a force acts on an object and causes a displacement of that
object.

E. Work occurs when force acts to hold an object in place.

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.)

While the change in blank will remain the same during a collision, the force needed to bring an object to a stop can be blank if the time if collision is blank

How can waves travel through ground?