Which group of quantities below consists only of scalar quantities? which group of quantities below consists only of scalar quantities? average speed, displacement, time interval?

What is the frequency of a light wave with a wavelength of 620nm

Spend time observing or thinking about events that involve matter and energy. which events can you explain? which events can’t you explain?

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.)