Difference between potential energy and kinetic energy (asap)

Which would not reduce the amount of green house gasses in the air

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?

You hang a book bag on a spring scale and place the bag on a platform scale so that the platform scale reads 23.7n and the spring scale reads 13.8n. what is the magnitude of the force that earth exerts on the bag?