Mechanical energy is the sum of two types of energy-kinetic energy and potential energy. Which of the following is an example of an object that has kinetic energy?
A. a snail crawling across a leaf
B. a computer monitor sitting on a desk
C. a tightly wound spring in a windup toy
D. a roller coaster car just before it goes downhill

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

Afeather of mass 0.001 kg falls from a height of 2 m. under realistic conditions, it experiences air resistance. based on what you know about friction, what can you say about the kinetic energy of the feather as it reaches the ground? acceleration due to gravity is g = 9.8 m/s2. a. ke < 0.0196 j b. ke = 00196 j c. je = 0 j d. ke > 0.0196 j

If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.