Physics: 27. The part of the Earth where life exists . Mesosphere Stratosphere Troposphere Biosphere

27. The part of the Earth where life exists .

stephanieeping

09.06.2022

elastic and gravitational

Explanation:

Mechanical energy is the sum of the kinetic energy and potential energy of an object:

E=K+U

where

$K=\frac{1}{2}mv^2$

is the kinetic energy of the object (with m being the object's mass and v is the object's speed),

while U is the potential energy. Potential energy refers to the position of the object, and it can be of two types:

- Gravitational potential energy: U=mgh , where g is the gravitational acceleration and h is the height of the object above the ground

- Elastic potential energy: $U=\frac{1}{2}kx^2$ , where k is the spring constant and x is the compression/stretching of the spring.

Therefore, the correct choice is:

elastic and gravitational

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