The superheroine Xanaxa, who has a mass of 68.1 kg , is pursuing the 75.3 kg archvillain Lexlax. She leaps from the ground to the top of a 193 m high building then dives off it and comes to rest at the bottom of a 16.1 m deep excavation where she finds Lexlax and neutralizes him. Does all this bring about a net gain or a net loss of gravitational potential energy?

The concept required to solve this problem is associated with potential energy. Recall that potential energy is defined as the product between mass, gravity, and change in height. Mathematically it can be described as

Here,

= Change in height

m = mass of super heroine

g = Acceleration due to gravity

The change in height will be,

The final position of the heroin is below the ground level,

The initial height will be the zero point of our system of reference,

Replacing all this values we have,

Since the final position of the heroine is located below the ground, there will net loss of gravitational potential energy of 10744.81J

some think that theories become laws, but theories and laws have separate and distinct roles in the scientific method. a law is a description of an observed phenomenon in the natural world that hold true every time it is tested. it doesn't explain why something is true; it just states that it is true.

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