A person goes to his friends home at the speed of 30 km/h and comes back at the speed of 40 km/h. what was his average speed throughout the entire trip?

An engineer designs a roller coaster so that a car travels horizontally for 162 ft, then climbs 127 ft at an angle of 31.0° above the horizontal. it then moves 127 ft at an angle of 46.0° 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.)

What object a collides with object b and bounces back its final momentum is?

Write a full page that sumerizes thermodynamics it’s from the website visionlearnig