thanks,
when a reply is 'a person yes', suspension bridge is non relevant. here with help of energy release attampt is made to prove new source of energy.
let me put further, to maintain its height a helicopter(here an object) say for rescue operation for an hour it has to continuously...
Human body is mass having energy. thanks to Joule it is proved.
Newton explained First, Second and Third laws.
Now,
1. Two equal amount of forces in opposite direction at a given time may not move the OBJECT as per third law of Newton. This is horizontal pull like Tug-of-War. Here 'x'...