Amechanical wave moves through a medium, which can be what?

In the sport of parasailing, a person is attached to a rope being pulled by a boat while hanging from a parachute-like sail. a rider is towed at a constant speed by a rope that is at an angle of 15 ∘ from horizontal. the tension in the rope is 1900 n. the force of the sail on the rider is 30∘ from horizontal. what is the weight of the rider? express your answer with the appropriate units.

Ways that industry and agriculture use physical properties to separate substances

An object dropped from cliff falls with a constant acceleration of 10 metre per second square find its speed of two seconds after it was dropped