Which are two types of mechanical energy electrical and kinetic nuclear and chemical radiant and thermal elastic and gravitational

elastic and gravitational

Explanation:

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

where

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: , where g is the gravitational acceleration and h is the height of the object above the ground

- Elastic potential energy: , where k is the spring constant and x is the compression/stretching of the spring.

Therefore, the correct choice is:

elastic and gravitational

28. evolution

29. environment, survive, offspring  

explanation:

the answer is mosques. they are an important part of islamic culture.