a 20kg box is attached to a rope what is the tension in the rope if the box moving up with constant velocity

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?

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 earth's motion, using the terms "precession" and "rotation" in your answer.