Each of the following objects possesses energy. Which forms of energy are mechanical, which are nonmechanical, and which are a combination?

(a) glowing embers in a campfire

(b) a strong wind

(c) a swinging pendulum

(d) a person sitting on a mattress

(e) a rocket being launched into space

a) glowing embers in a campfire : It is a non mechanical conversion

(b) a strong wind: Kinetic or mechanical

(c) a swinging pendulum: A combination of potential and kinetic energy.

(d) a person sitting on a mattress: potential energy or mechanical

(e) a rocket being launched into space : kinetic and potential.