An airplane is flying at a constant speed in a positive direction. it slows down when it approaches the airport where it's going to land. which term describes the slowing of the plane?

a) stationary
b) positive velocity
c) positive acceleration
d) negative acceleration
e) constant velocity

An object is moving east, and it’s velocity changes from 65m/s to 25m/s in 10 seconds. which describes the acceleration?

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.)

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat