On a timer !

as a person pushes a box across a floor, the energy from the person’s moving arm is transferred to the box, and the box and floor become warm. during this process, energy is:
A. increased
B. conserved
C. destroyed
D. decreased
E. created

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat

What is the major limitation to the light microscope?