Question

Prove and State the the law of conservation of energy

Answer 1

Law conservation of energy says that Energy always remains constant. It means energy can neither be created and nor can be destroyed. It says one form of energy can be changed into another form. 

Proof is deduced by equating the Ec to the Ep, that is:1/2 mv "= mgh; simplifying masses v" / 2 = gh; V "= 2gh; v = (square root) 2gh.This is the escape velocity to the gravitational attraction, that is to say the speed q has to take a ship to escape of the terrestrial gravity. Its value if you substitute then q is approx. 11200 m / sg or 11.2 km / sg, and is called escape velocity (Ve).

Note: h equals terrestrial radius = 6380 km. V = (square root) 2gRt. 11200m / s is 40320 km / h.