A 9 kg stone drops from a height of 20 meters. What is its velocity when it hits the ground? A.) 17.2 m/s

B.) 21.2 m/s

C.) 19.8 m/s

D.) 16.1 m/s

What formula  this one  (x_/

Current supplied to consumers from generating plants like coal power plant, nuclear power plant, geothermal and others are in form of alternating current instead of direct current because it can be transported easily in a long distance. also, the alternating current has a wide range of frequency and the amount or energy can be increased or decreased.

Answera volcano just before it erupts